investigatively
In an investigative manner.

investigatorily
In an investigatory manner.

inveterately
For a long time.

inviably
In an inviable manner.

invidiously
In an invidious manner.

invigoratingly
In an invigorating manner.

invigoratively
In an invigorative manner.

invincibly
In an invincible manner; unconquerably; insuperably.

inviolably
In an inviolable manner; without violation or violence of any kind.

inviolately
In an inviolate manner.

invisibly
In a way that can not be seen; in an invisible manner.

invitationally
invitingly

invitingly
In an inviting manner; so as to attract; attractively.

invokingly
So as to invoke.

involuntarily
In an involuntary manner; done without conscious thought.

involutely
In an involute manner.

involvedly
In an involved manner.

invulnerably
In an invulnerable manner.

inwardly
In an inward manner; to or toward the inside or to oneself.
Completely, fully.

inwards
Towards the inside.

ionically
using ionic bonds

ionophoretically
By ionophoretic means.

ionospherically
In terms of the ionosphere.

iontophoretically
By means of iontophoresis.

ipsatively
In an ipsative manner.

ipsilaterally
On the same side of the body.

ipsilesionally
On the same side as a lesion.

irascibly
In an irascible manner.

irately
In an irate manner; angrily.

irefully
In an ireful manner; angrily; wrathfully.

irenically
In an irenical manner.

iridescently
In an iridescent manner.

irksomely
In an irksome manner; tediously.

ironhandedly
In an ironhanded manner; strictly and harshly.

ironically
In an ironic manner; in a way displaying irony.
Used to draw attention to an ironic aspect of a situation being described.

ironice
ironically

irradiatingly
So as to irradiate.

irradicably
In an irradicable manner.

irrationably
Irrationally.

irrationally
In an irrational manner; without reason; in a manner contrary to reason

irreciprocally
In an irreciprocal manner; by not giving back some expected response.

irreclaimably
In an irreclaimable manner.

irreconcilably
In an irreconcilable manner; so as to preclude reconciliation.

irrecoverably
In an irrecoverable manner; beyond recovery.

irrecuperably
In an irrecuperable way.

irrecusably
In an irrecusable manner.

irredeemably
In an irredeemable manner; beyond redemption.

irreducibly
In an irreducible manner or state.

irreflexively
In an irreflexive manner.

irreformably
Such that it cannot be reformed.

irrefragably
In an irrefragable state or condition.

irrefrangibly
In an irrefrangible manner.

irrefusably
In an irrefusable manner; beyond the possibility of refusal.

irrefutably
In an irrefutable manner; beyond the possibility of refutation.

irregardlessly
regardless

irregularly
In an irregular manner; without rule, method, or order.

irrelatively
In an irrelative manner.

irrelevantly
In an irrelevant manner.

irreligiously
In an irreligious fashion.

irremediably
In a manner, or to a degree, that precludes remedy, cure, or correction; in an irremediable way.

irremissibly
In an irremissible manner; unpardonably.

irremovably
So as not to be removable.

irreparably
Such that it cannot be repaired.

irrepealably
Such that it cannot be repealed.

irreplaceably
In an irreplaceable manner; (frequently) uniquely, singularly.

irreprehensibly
In an irreprehensible manner.

irrepressibly
In a manner or to a degree that can not be repressed; in an irrepressible way.

irreproachably
In an irreproachable manner; blamelessly.

irreproducibly
In an irreproducible manner; in a way that cannot be reproduced or that will not allow of reproduction

irreprovably
In a irreprovable manner; irreproachably.

irreptitiously
In an irreptitious manner.

irresistably
Dated form of irresistibly.

irresistibly
In an irresistible manner.

irresolubly
In a irresoluble manner.

irresolutely
In an irresolute or wavering manner.

irresolvably
In an irresolvable manner.

irresolvedly
Without resolution; in a hesitating or doubtful manner

irrespectively
Without regard to conditions; not taking circumstances into consideration.

irresponsibly
In an irresponsible manner; so as to be irresponsible.

irresuscitably
So as not to be resuscitated; in an irresuscitable manner.

irretrievably
In an irretrievable manner; irrecoverably.

irreverently
In an irreverent manner.

irreversibly
In an irreversible manner.

irrevocably
In an irrevocable manner; in a manner which prevents the ability to be reverted, repealed, or undone.

irrevokably
Alternative spelling of irrevocably.

irrhythmically
In an irrhythmic manner; not rhythmically.

irrigably
Such that it can be irrigated.

irrigationally
In terms of irrigation.

irritably
In an irritable manner.

irritatedly
In an irritated manner.

irritatingly
In an irritating way; in a manner causing irritation, or that irritates.

irrotationally
Without rotation.

irruptively
In an irruptive manner.

isagogically
In an isagogic manner.

ischaemically
Alternative form of ischemically.

ischemically
In an ischemic manner

ischiogluteal
ischial and gluteal

isentropically
In an isentropic way.

ish
Pronunciation spelling of is.

ishes
plural of ish

islandwards
islandward; towards an island.

isleward
Toward an island.

isobarically
In an isobaric manner; at constant pressure

isobolographically
By means of isobolography.

isocalorically
In an isocaloric manner

isocentrically
In an isocentric manner or direction

isochratically
Misspelling of isocratically.

isochronally
In an isochronal manner.

isochronously
In an isochronous manner.

isoclinally
In an isoclinal manner.

isocratically
In an isocratic manner

isodiametrically
In an isodiametric manner.

isodynamically
In an isodynamic manner.

isoeccentrically
In an isoeccentric manner

isoeffectively
In an isoeffective manner

isoelastically
In an isoelastic manner.

isoelectrically
At equal electric potential

isoenergetically
In an isoenergetic manner

isofunctionally
In an isofunctional manner.

isogeneically
In an isogeneic manner

isogenically
In an isogenic manner

isogonally
In an isogonal manner.

isohedrally
In a isohedral manner.

isohelically
In an isohelical manner

isokinetically
In an isokinetic manner.

isolably
Such that it can be isolated.

isolatedly
In an isolated manner.

isolationistically
In a way that exhibits isolationism.

isolinearly
In an isolinear manner

isolobally
In an isolobal way.

isomerically
In an isomeric manner; with regard to isomers.

isomerously
In an isomerous manner.

isometrically
In an isometric manner.

isomorphically
In an isomorphic manner.

isomorphously
In an isomorphous manner

isoosmotically
Alternative form of isosmotically.

isoperimetrically
Having the same perimeter.

isopycnically
In an isopycnic manner

isorhythmically
In an isorhythmic way.

isosexually
In an isosexual manner

isosmotically
With the same osmotic pressure.

isospectrally
In an isospectral manner.

isostatically
In an isostatic manner.

isosterically
In an isosteric manner

isostoichiometrically
In an isostoichiometric manner

isostructurally
In an isostructural manner

isosynchronously
In isosynchronous fashion.

isotachophoretically
By means of isotachophoresis.

isotensionally
In an isotensional manner

isothermally
In an isothermal manner; at constant temperature

isothermically
In an isothermic manner.

isotomically
In an isotomic manner.

isotomously
In an isotomous manner

isotonically
In an isotonic way.

isotopically
With regard to isotopes

isotropically
In an isotropic manner; so as to exhibit the same properties or behavior in all directions.

isotypically
In an isotypic manner

isovalently
In an isovalent manner

isovolumetrically
In an isovolumetric manner

issuably
In an issuable manner; by way of issue.

istid
Pronunciation spelling of instead.

italically
In italic type.

itchily
In an itchy way.

itchingly
With an itching sensation.

itemwise
With regard to items
One item at a time

iterably
In an iterable manner.

iteratively
In an iterative manner; using iteration.