12-Letter Words Starting with I

Tending to invalidate or prove false.

Process of making a thing no longer valid

Invalidator

Invalidity

INVASIVE aggressive

Animal with no backbone

Animal without a backbone

Backboneless creature

""INVESTIGATE To follow up step by step by patient inquiry or observation; to trace or track mentally; to search into; to inquire and examine into with care and accuracy; to find out by careful inquisition; as, to investigate the causes of natural phenomena. as, to investigate the causes of natural phenomena.""

What Brewster's committee does

One making a search or enquiries

One making a search or enquiry

Private eye

Inveteracy

Stubbornly

INVIGILATE To keep watch.

Keeping watch over examination candidates to prevent cheating.

Invigilator

Bracing

Action of strengthening

Enlivening process

Invigorator

""Open only to persons issued an invitation; -- of gatherings, usually sports events; as, an invitational tournament.as, an invitational tournament.""

Invitatory

""INVOCATION The act or form of calling for the assistance or presence of some superior being; earnest and solemn entreaty; esp., prayer offered to a divine being.""

INVOLUTION The act of involving or infolding.

Impossible to hurt

Run with last bit of email, cc from Vince Cable - redraft can't be damaged

""INVULNERABLE Incapable of being wounded, or of receiving injury.""

Inwardness

Ipecacuanha

Hot temper

""IRONICAL pertaining to irony, also IRONIC""

Irradiation

Sans sense

Unreasonableness shown by Irish supporter about quota

Not able to be saved

Beyond being saved

Can't be saved by teacher losing the head with convert up to the task

""IRREDEEMABLE Not redeemable; that can not be redeemed; not payable in gold or silver, as a bond; used especially of such government notes, issued as currency, as are not convertible into coin at the pleasure of the holder.""

Incapable of being reformed; incorrigible.

""Not refragable; not to be gainsaid or denied; not to be refuted or overthrown; unanswerable; incontestable; undeniable; as, an irrefragable argument; irrefragable evidence. as, an irrefragable argument; irrefragable evidence.""

""IRREFRAGABLE Not refragable; not to be gainsaid or denied; not to be refuted or overthrown; unanswerable; incontestable; undeniable; as, an irrefragable argument; irrefragable evidence. as, an irrefragable argument; irrefragable evidence.""

*No matter

Common malapropism used to mean "Nonetheless!"

Fluctuation

Abnormality

Irrelative

Irrelevance

Irrelevant

Irish army unit with French 4 that 26

""In a manner, or to a degree, that precludes remedy, cure, or correction.""

""Not repealable; not capable of being repealed or revoked, as a law.""

Setter with Observer: all new and very puzzling

Peevishness

Tetchiness

Irritating

Not rotatory; passing from one point to another by a movement other than rotation; said of the movement of parts of a liquid or yielding mass.

ISOANTIGEN

Isochronal

Developed alike in the directions of the several lateral axes; said of crystals of both the tetragonal and hexagonal systems.

ISOENZYME

Doctrine to be fought on home front

Policy of remaining apart

Political policy of non-involvement with other countries

Phenomenon of the 1940's.

Unpopular person after Pearl Harbor.

One not getting involved in other countries' affairs

English word

Isothermal

ISOTONIC of equal tension

ISOTOPIC pertaining to an {isotope=n}

""ITALIANATE To render Italian, or conformable to Italian customs; to Italianize.""

ITALIANISE

ITALIANIZE To play the Italian; to speak Italian.

Itemization

Itinerancy

Itineration