illogical.adjective
not observing the principles of logic; devoid of logic; senseless
illogicality, illogicalness.nouns
illogically.adverb

insolence.noun
the state of being insolent; arrogance; impudence
insolent.adjective
impertinent; impudent

insolent.adjective
disrespectful of custom or authority; impudent; arrogant

intrinsic.adjective
belonging to the essential nature or constitution of a thing (the intrinsic worth of a gem) (the intrinsic brightness of a star); contrast extrinsic
intrinsically.adverb

idiom.noun
a speech form or an expression of a given language that is peculiar to itself grammatically or cannot be understood from the individual meanings of its elements, as in 'take to heart', 'in spite of', 'by virtue of', etc.; the language peculiar to a people or to a district, community, or class; dialect; the syntactical, grammatical, or structural form peculiar to a language; manner, style

idiomatic.adjective
of, relating to or; conforming to idiom;-peculiar to a particular group, individual, or style 
idiomaticness.noun
idiomatically.adverb

imbue.transitive verb
inflected form(s).imbued, imbuing
to permeate or influence as if by dyeing; to tinge or dye deeply 
synonym.infuse

imperceptible.adjective
extremely slight, gradual, or subtle; not perceptible by the senses or mind 
imperceptibly.adverb

imply, implied, implying, implies.transitive verbs
to hint; to indicate without saying openly or directly (his tone implied disapproval); suggest; to involve by logical necessity; entail (life implies learning, growth and death; to express or indicate indirectly.(his tone implied disapproval

implication.noun
the act of implicating or the condition of being implicated; the act of implying or the condition of being implied; something that is implied, especially (an indirect indication; a suggestion); an implied meaning; implicit.significance; suggest; an inference
implicative.adjective
implicatively.adverb

implicate, implied, implying, implies.transitive verbs
inflected form(s)-implicated, implicating
from Latin, to entwine.(to involve, to employ; intimately connected (what is the far reaching implication of his decision?); to have as a consequence, corollary, or natural inference; to imply; to bring into intimate or incriminating connection; to involve in the nature or operation of something; entail (life implies growth and death)

inculcate, inculcated, inculcating, inculcates.transitive verbs
inflected form(s)-inculcated, inculcating
to teach and impress upon the mind of another by frequent instruction or repetition; instil; indoctrinate; propagandize; implant
inculcation, inculcator, inculcation & inculcator-nouns

insipid.adjective
devoid of qualities that make for spirit and character.(the new chilies are missing the fire we enjoyed earlier); lacking taste or savor; tasteless; lacking in qualities that interest, stimulate, or challenge; dull, flat
insipidity.noun
insipidly.adverb 
synonyms.vapid, flat, jejune, banal, inane
insipid implies a lack of sufficient taste or savor to please or interest (an insipid romance) 
vapid suggests a lack of liveliness, force, or spirit (an exciting story given a vapid treatment)
flat applies to things that have lost their sparkle or zest (although well regarded in its day, the novel now seems flat)

jejune suggests a lack of rewarding or satisfying substance (a jejune and gassy speech)

banal stresses the complete absence of freshness, novelty, or immediacy (a banal tale of unrequited love) banal.adjective-drearily commonplace and often predictable; trite
banalize.verb
banally.adverb
banality.noun
the condition or quality of being banal; triviality; something that is trite, obvious, or predictable; a commonplace

inane, inaner, inanest.adjective
lacking sense or substance; empty (an inane comment; a ditzy person); implies a lack of any significant or convincing quality (an inane interpretation of the play); unintelligent-
inanely.adverb

itinerant.adjective
traveling from place to place, especially to perform work or a duty (an itinerant judge, itinerant labor)
itinerant.noun 
one who travels from place to place

irresolute.adjective
unsure of how to act or proceed; undecided; lacking in resolution; indecisive
irresolutely.adverb
irresoluteness or irresolution.nouns

institutionalize, institutionalized, institutionalizing, institutionalizes.transitive verbs
to make part of a structured and usually well established system; to make into, treat as, or give the character of an institution to; to place (a person) in the care of an institution
institutionalization.noun

impact, impacted, impacting, impacts.verbs
transitive verb use.to pack firmly together; wedged or packed in, so as to fill or block an organ or a passage (impacted feces); to strike forcefully (meteorites impacting the lunar surface); to have an effect or impact on
intransitive verb use.to have an effect or impact
impaction.noun
impact.noun
the striking of one body against another; collision; the force or impetus transmitted by a collision; the effect or impression of one thing on another (still gauging the impact of automation on the lives of factory workers); the power of making a strong, immediate impression (a speech that lacked impact)

inalienable.adjective
that cannot be transferred to another or others (inalienable rights)
inalienability.noun
inalienably.adverb

intellect.noun
the ability to learn and reason; the capacity for knowledge and understanding; the ability to think abstractly or profoundly; mind; a person of great intellectual ability; intelligent

inconsequential.adjective
lacking importance; not following from premises or evidence; illogical
inconsequential.noun
a triviality
inconsequentiality.or.inconsequentialness.noun
inconsequentially.adverb

immaterial.adjective
of no importance or relevance; inconsequential or irrelevant; having no material body or form
immaterially.adverb
immaterialness.noun

insubstantial.adjective
lacking substance or reality; immaterial; not firm or solid; flimsy; delicate; fine
insubstantiality.noun