irredentist
Someone who calls for the seizure or recovery of territories or states currently subject to other countries; an adherent of irredentism.

irredentistic
irredentist

irredundant
Containing no redundant constraint.

irreferable
That cannot be referred or related to something else.

irreferential
Lacking a referent.

irreflective
Without mental reflection.

irreflexive
Of a binary relation R on X: such that no element of X is R-related to itself.

irreformable
That cannot be reformed

irrefrangible
Not to be broken or transgressed against; inviolable.
Incapable of being refracted.

irrefusable
That cannot be refused.

irrefutable
undeniable; unable to be disproved or refuted

irreg
Abbreviation of irregular.

irregardful
Regardless.

irregardless
Irrespective, regardless.

irregenerate
Not regenerate; unregenerate.

irregible
Not regible; ungovernable, unmanageable, intractable.

irrejectable
That cannot be rejected; irresistible.

irrelapsable
Not liable to relapse; unrelenting; secure.

irrelated
unrelated

irrelative
Having no relations to each other; unrelated.
Not related to the subject at hand; irrelevant.
Describing two or more chords which do not share any notes in common.

irrelephant
Not related to elephants; irrelevant to the consideration or discussion of elephants.

irreliable
unreliable

irreligious
Having no relation to religion.
Contrary to religious beliefs and practices.
Contrary to religious beliefs and practices.

irremediable
Unable to be remedied, cured, corrected or repaired; irreparable, incurable.

irremissible
Not remissible.

irremittable
not capable of being remitted; irremissible

irremovable
Not removable; immovable; inflexible.

irremunerable
Not remunerable.

irrepairable
That cannot be repaired.

irreparable
Incapable of being repaired, amended, cured or rectified; unrepairable.

irreparate
irreparable

irrepatriable
Not repatriable.

irrepealable
That cannot be repealed.

irrepearable
Misspelling of irreparable.

irrepeatable
Alternative form of unrepeatable.

irreplacable
Misspelling of irreplaceable.

irreplaceable
Incapable of being replaced, especially because of uniqueness or finiteness.

irrepleviable
Not capable of being replevied.

irreplevisable
Alternative form of irrepleviable.

irreplicable
Incapable of being replicated.

irreprehensible
not reprehensible, blameless, without blame; innocent

irrepresentable
Not capable of being represented or portrayed.

irrepressible
Not containable or controllable.
Especially high-spirited, outspoken, or insistent.

irreproachable
Free from blame, not open to reproach or criticism; blameless.

irreproducible
that cannot be reproduced or duplicated

irreprovable
Not reprovable; irreproachable.

irrepudiable
Not to be repudiated.

irrepugnable
That cannot be repugned; not repudiable; irresistible; irrefutable; unobjectionable.

irrescindable
Synonym of unrescindable.

irresectable
Not resectable.

irresilient
Not resilient; not recoiling or rebounding; inelastic.

irresistable
Dated form of irresistible.

irresistible
Impossible to resist.
Compellingly attractive.

irresoluble
difficult if not impossible to resolve; irresolvable.

irresolute
Undecided or unsure how to act.
Indecisive or lacking in resolution.

irresolvable
Impossible to resolve; insoluble.
Impossible to separate into its component parts.

irresolvables
plural of irresolvable

irrespirable
Not respirable; not suitable for breathing; unbreathable.

irresponsible
Not responsible; exempt from legal responsibility, not to be held accountable.
Lacking a sense of responsibility; performed or acting as though without responsibility; negligent.

irresponsive
That does not respond to stimuli; unresponsive.

irrestrainable
That cannot be restrained.

irresultative
Indicating an event or action not taken to completion, as with "I was writing" but not "I wrote".

irresuscitable
Incapable of being resuscitated or revived.

irretentive
Not retentive; not apt to retain.

irreticent
Unreserved, not reticent.

irretraceable
Not retraceable; unable to be retraced.

irretractable
Synonym of nonretractable.

irretractile
Not retractile.
Not tractile or ductile.

irretrievable
Not retrievable; irrecoverable; irreparable

irreverend
Not reverend (not worthy of respect)
irreverent

irreverent
Lacking respect; not having or not showing respect for or seriousness towards something that is usually treated with respect; going against conventional precepts.

irreverential
Not reverential.

irreversable
Alternative form of irreversible.

irreversible
Incapable of being reversed or turned about or back; incapable of being made to run backwards.
Incapable of being reversed, recalled, repealed, or annulled.
Incapable of being reversed to the original state without consumption of free energy and increase of entropy.

irreviewable
Not eligible for review.

irrevisable
Impossible to revise or change.

irrevivable
Alternative form of unrevivable.

irrevocable
Unable to be retracted or reversed; final.

irrevokable
Alternative spelling of irrevocable.

irrevoluble
That has no finite period of revolution; not revolving.

irrhythmic
Having no rhythm.

irridescent
Misspelling of iridescent.

irridiating
Misspelling of irradiating.

irrigable
Able to be irrigated.

irrigatable
Capable of being irrigated.

irrigational
Of or pertaining to irrigation.

irrigative
Relating to irrigation.

irrigatorial
Relating to irrigation.

irrigatory
Relating to irrigation.

irrisistible
Misspelling of irresistible.

irrisory
Expressing irrision; mocking.

irritable
Capable of being irritated.
Easily exasperated or excited.
Responsive to stimuli.

irritant
Causing irritation or inflammation.
Rendering null and void; conditionally invalidating.

irritants
plural of irritant

irritatable
Capable of being irritated; irritable.

irritated
simple past and past participle of irritate

irritational
Relating to irritation.

irritative
serving to excite or irritate
accompanied with, or produced by, increased action or irritation

irritatives
plural of irritative

irritatory
Producing irritation.

irrotational
Not rotating or not pertaining to rotation.
Having zero curl.

irrubrical
Contrary to the rubric or convention; not rubrical.

irruent
rushing, moving quickly, especially inwards

irruptive
Having the quality of irrupting or making irruptions.

irruptives
plural of irruptive

irtal
plural of ratal

isadelphous
Having an equal number of stamens in each of the two phalanges.

isagogic
introductory

isagogical
Alternative form of isagogic.

isallobaric
Relating to isallobars.

isandrous
Having the stamens similar and equal in number to the divisions of the corolla.

isantherous
Having equal anthers.

isanthesic
Relating to a kind of isoline that joins places on the Earth where the flowers of a particular plant species bloom at the same time.

isapostolic
Having equivalent, or almost equivalent, authority with the apostles or their teachings.

isarithmic
Using or relating to isolines (isarithms).
Keeping the number of packets in a network constant.

isatinic
Relating to isatin.

ischaemic
British English spelling of ischemic.

ischatic
Misspelling of ischiatic.

ischemial
Synonym of ischemic.

ischemic
Characteristic of, or accompanied by, ischemia — localised anaemia due to mechanical obstruction of the blood supply, creating a local disturbance in blood circulation.

ischiac
Relating to the ischium.

ischial
Pertaining to the ischium.

ischialgic
Of or relating to ischialgia.

ischian
Alternative form of ischial.

ischiatic
Of or pertaining to the ischium

ischioanal
Of or relating to the ischium and anus.

ischiocapsular
Of or relating to the ischium and the capsule of the hip joint.

ischiocavernosal
Of or pertaining to the ischiocavernosus.

ischiocavernous
Synonym of ischiocavernosal.

ischiococcygeal
Relating to the ischium and coccyx.

ischiocrural
Located between the ischium and the crures.