Frivolous litigation is the use of legal processes with apparent disregard for the merit of one's own arguments. It includes presenting an argument with reason to know that it would certainly fail, or acting without a basic level of diligence in researching the relevant law and facts. That an argument was lost does not imply the argument was frivolous; a party may present an argument with a low chance of success, so long as it proceeds from applicable law.

Frivolous litigation may be based on absurd legal theories, may involve a superabundance or repetition of motions or additional suits, may be uncivil or harassing to the court, or may claim extreme remedies. A claim or defense may be frivolous because it had no underlying justification in fact, or because it was not presented with an argument for a reasonable extension or reinterpretation of the law.  A claim may be deemed frivolous because existing laws unequivocally prohibit such a claim, such as a so-called Good Samaritan law.

In the United States, Rule 11 of the Federal Rules of Civil Procedure and similar state rules require that an attorney perform a due diligence investigation concerning the factual basis for any claim or defense. Jurisdictions differ on whether a claim or defense can be frivolous if the attorney acted in good faith. Because such a defense or claim wastes the court's and the other parties' time, resources and legal fees, sanctions may be imposed by a court upon the party or the lawyer who presents the frivolous defense or claim. The law firm may also be sanctioned, or even held in contempt.

US Federal statutes and rules of court penalizing frivolous litigation
In the United States Tax Court, frivolous arguments may result in a penalty of up to $25,000 under . Similarly, section 7482 of the Internal Revenue Code provides that the U.S. Supreme Court and the U.S. Courts of Appeals may impose penalties in which the taxpayer's appeal of a U.S. Tax Court decision was "maintained primarily for delay" or where "the taxpayer's position in the appeal is frivolous or groundless." A common example, as shown below, is an argument based on tax protestor claims.

In a noncriminal case in a U.S. District Court, a litigant (or a litigant's attorney) who presents any pleading, written motion or other paper to the court is required, under Rule 11 of the Federal Rules of Civil Procedure, to certify that, to the best of the presenter's knowledge and belief, the legal contentions "are warranted by existing law or by a nonfrivolous argument for the extension, modification, or reversal of existing law or the establishment of new law". Monetary civil penalties for violation of this rule may in some cases be imposed on the litigant or the attorney under Rule 11.

In one case, the Seventh Circuit Court issued an order giving such an attorney "14 days to show cause why he should not be fined $10,000 for his frivolous arguments". A similar rule penalizing frivolous litigation applies in U.S. Bankruptcy Court under Rule 9011.

The U.S. Congress has enacted section 1912 of Title 28 of the U.S.C. providing that in the U.S. Supreme Court and in the U.S. Courts of Appeals where litigation by the losing party has caused damage to the prevailing party, the court may impose a requirement that the losing party pay the prevailing party for those damages.

Litigants who represent themselves (in forma pauperis and pro se) sometimes make frivolous arguments due to their limited knowledge of the law and procedure. The particular tendency of prisoners to bring baseless lawsuits led to passage of the Prison Litigation Reform Act of 1995, which limits the ability of prisoners to bring actions without payment.

Court treatment of frivolous arguments
An example of a Court's treatment of frivolous arguments is found in the case of Crain v. Commissioner, 737 F.2d 1417 (1984), from the United States Court of Appeals for the Fifth Circuit:

Impact upon filing attorney
Filing a claim that is ultimately deemed frivolous can be highly damaging to the attorney so filing. Most frivolous lawsuits that are successful are filed without an attorney. Attorney Daniel Evans writes:

Examples

Washington v. Alaimo
In Washington v. Alaimo the court listed more than seventy-five frivolous "motions" (a request for a court to issue an order), all of which required the attention of the Court, including the following:
 "Motion to Behoove an Inquisition"
 "Motion for Judex Delegatus"
 "Motion for Restoration of Sanity"
 "Motion for Deinstitutionalization"
 "Motion for Publicity"
 "Motion to Vacate Jurisdiction"
 "Motion for Cesset processus"
 "Motion for Nunc pro tunc"
 "Motion for Psychoanalysis"
 "Motion to Impeach Judge Alaimo"
 "Motion to Renounce Citizenship"
 "Motion to Exhume Body of Alex Hodgson"
 "Motion to Invoke and Execute Rule 15—Retroactive Note: The Court's School Days are Over"
 "Motion for Skin Change Operation"
 "Motion for Catered Food Services"
 "Motion to Kiss My Ass"

Washington, an inmate from Georgia, was eventually prohibited from filing any future lawsuits or motions in any district court unless he first posted a contempt bond of $1,500. To be deemed frivolous, a litigant's arguments must strike beyond the pale.

Pearson v. Chung
In 2005, in Pearson v. Chung, Roy Pearson, a Washington, D.C. judge, sued a dry cleaning business for $67 million for allegedly losing a pair of his pants. This case has been cited as an example of frivolous litigation. According to Pearson, the dry cleaners lost his pants (which he brought in for a $10.50 alteration) and refused his demands for a large refund. Pearson believed that a sign saying "Satisfaction Guaranteed" in the window of the shop legally entitled him to a refund for the cost of the pants, estimated at $1,000. The $54 million total also included $2.0 million in "mental distress" and $15,000 which he estimated to be the cost of renting a car every weekend to go to another dry cleaners. The court ultimately ruled against Pearson, whose judgeship was subsequently not renewed due to this case and several other actions he filed during his divorce, which were found to demonstrate a lack of "judicial temperament".

Jonathan Lee Riches
In 2010, federal prosecutors asked a judge to help them stop Jonathan Lee Riches from filing any more lawsuits, arguing that his frequent filings were frivolous.

Gloria Dawn Ironbox
In July 2013, the Human Rights Tribunal of Ontario dismissed a complaint laid by a man posing as Gloria Dawn Ironbox, a fictional feminist attorney on television series Family Guy. The claimant alleged that a marketing scheme by A&W Restaurants was "heteronormative", "phallocentric" and promoted "cross-sectional hegemony". Citing feelings of distress and alienation over the lack of "LGBT" representation in A&W naming conventions, he demanded $50,000 in damages for injury to dignity and self-respect as well as an order requiring A&W to adopt naming conventions which include non-traditional families. One such product the claimant demanded was the "Pillow Biter", described by the claimant as "a large, dark slab of meat stuffed firmly between two, white, clenched buns".

Sirgiorgio Sanford Clardy
In January 2014, Sirgiorgio Sanford Clardy, who is serving a 100-year prison sentence for a beating of a prostitute and her customer, filed "a $100 million lawsuit against Nike", in which he claimed that Nike was partially responsible for the assault he committed. Clardy said that Nike should have placed a label in his Jordan shoes warning consumers that they could be used as a dangerous weapon. He was wearing a pair when he repeatedly stomped the face of a client who was trying to leave a Portland hotel without paying Clardy's prostitute in June 2012. This lawsuit 
url=https://www.oregonlive.com/portland/2014/10/pimp_whose_100_million_suit_fa.html
gained "considerable attention across the nation and the world".

Romine v. Stanton
In March 2016, James Romine, one-half of the independent video games developer Digital Homicide Studios, sued video game critic James Stephanie Sterling for criticizing the games published under his studios' name, seeking $10 million in damages for "assault, libel, and slander" to Romine's business. He claimed that Sterling's coverage of his studio's game The Slaughtering Grounds as "Worst Game of 2014 Contender" was not protected under fair use law because he did not believe it was "fair" criticism. An additional lawsuit for $18 million was filed against 100 users on the Steam gaming platform for criticizing their games and business practices, which he had interpreted as "harassment". The judge issued a subpoena against Valve to disclose the identities of those 100 users. This resulted in Valve removing all published games from Digital Homicide Studios. In addition, Romine filed the lawsuit as an individual and not as a corporation, so such criticism was protected under the right to freedom of speech. The case was dismissed with prejudice in February 2017. This case is also an example of abuse of DMCA takedown requests on YouTube.

Erik Estavillo vs Twitch, Inc
In June 2020, Erik Estavillo filed a lawsuit against Twitch, claiming that the streaming platform was responsible for his sex addiction, with damages of $25 million, which was to be split between him, Twitch Prime subscribers, and COVID-19 charities.   He claimed that Twitch's "twisted programming and net code" made it "nearly impossible to use Twitch without being exposed to sexual content". Other claims included him "chaffing his penis every day with [a fleshlight]" and causing a fire by ejaculating on his computer monitor. The filing contained pictures of the female Twitch streamers (such as Amouranth and Pokimane), who he wanted banned from the platform. Estavillo had previously sued Blizzard, Microsoft, Sony, and Nintendo. All of these lawsuits were dismissed with prejudice.  This case was dismissed as frivolous in January of 2021.

See also

Abuse of process
Anders v. California
Barratry
Franchise fraud
Frivolous or vexatious
Judith Richardson Haimes
Malicious prosecution
Michigan Lawsuit Abuse Watch
 Pseudolaw
Stella Awards
SLAPP
Spamigation
Tax protester arguments
Tax protester
Tort reform
Vexatious litigation

Notes

External links
Lawsuit.no: Frivolous lawsuit archive

Abuse of the legal system
Civil procedure
American legal terminology
Tort law