insincere
Not genuinely meaning what has been expressed; not sincere; artificial; factitious.

insincerest
superlative form of insincere: most insincere

insinuate
To hint; to suggest tacitly (usually something bad) while avoiding a direct statement.
To creep, wind, or flow into; to enter gently, slowly, or imperceptibly, as into crevices.
To ingratiate; to obtain access to or introduce something by subtle, cunning or artful means.

insinuational
Of or relating to insinuation.

insinuative
Tending to insinuate; insinuating

insinuatory
Insinuative.

insipider
comparative form of insipid: more insipid

insipidest
superlative form of insipid: most insipid

insipient
foolish; lacking wisdom; stupid

insober
Lacking sobriety; drunk.

insobrietous
Not sober; drunk.

insol
Abbreviation of insoluble.

insolational
Relating to insolation.

insolent
Insulting in manner or words, particularly in an arrogant or insubordinate manner.
Rude.

insolubilized
simple past and past participle of insolubilize

insoluble
That cannot be dissolved.
That cannot be solved.
That cannot be explained.
That cannot be broken down or dispersed.

insolubles
plural of insoluble

insolvable
Impossible to solve; insoluble.
Incapable of being paid or discharged.
Not capable of being loosed or disentangled; inextricable.

insolvated
absorbed by solvation

insolvent
Unable to pay one's bills as they fall due.
Owing more than one has in assets.
Not sufficient to pay all the debts of the owner.

insomniac
One who suffers an inability or difficulty sleeping; a sufferer from insomnia.

insomnious
restless; sleepless

insomnolent
characterized by an inability to sleep, experiencing insomnia.

insonicated
simple past and past participle of insonicate

insonorous
Not clear or melodious.

insouciant
Casually unconcerned; carefree, indifferent, nonchalant.

insourced
simple past and past participle of insource

inspecific
Nonspecific, unspecific.

inspectable
Able to be inspected.

inspectional
Of or pertaining to an inspection.

inspective
Engaged in inspection; involving inspection.

inspectoral
Alternative form of inspectorial.

inspectorial
Of or pertaining to an inspector or to inspection.

inspirable
Able to be inspired.
Able to be inhaled; breathable.

inspiral
Describing the paths of a pair of astronomical bodies (e.g. binary stars or black holes) that are spiralling in towards each other, losing energy to gravitational waves.

inspirational
Having the ability to inspire.

inspirationals
plural of inspirational

inspirationless
without inspiration

inspirative
Tending to inspire.

inspiratory
Of or pertaining to inspiration (in all senses)

inspissant
A thickening agent.

inspissants
plural of inspissant

instable
Exhibiting instability; unstable

instafamous
Having achieved fame very suddenly.

installable
Capable of being installed.

installational
Of or pertaining to installation.

installationlike
Resembling or characteristic of an art installation.

instantaneous
Occurring, arising, or functioning without any delay; happening within an imperceptibly brief period of time.

instantiable
That can be instantiated.

instantial
Relating to, being, or constituting an instance.
Relating to, being, or constituting an instance.

instantiatable
Synonym of instantiable.

instantonic
Of, pertaining to, or comprising instantons

instate
To install (someone) in office; to establish.

instealing
entering or manifesting surreptitiously

instepped
Having a specified kind of instep.

instigative
Tending to instigate.

instigatory
Tending to instigate or provoke.

instillatory
Relating to instillation.

instinctive
Related to or prompted by instinct.
Driven by impulse, spontaneous and without thinking.

instinctless
without instinct

instinctual
Of, relating to, or derived from instinct.

institorial
Relating to an agent or factor.

institutional
Of, pertaining to, characteristic of, or organized along the lines of an institution.
Instituted by authority.
Elementary; rudimentary.
Arising from the practice of an institution.

institutionalist
Of, pertaining to, or following institutionalism

institutionalists
plural of institutionalist

institutionalizable
Able to be institutionalized.

institutionalized
simple past and past participle of institutionalize

institutionary
Relating to an institution or institutions.
Containing the first principles or doctrines; rudimentary.

institutionwide
Throughout an institution.

institutive
Tending or intended to institute; having the power to establish.
Established; depending on, or characterized by, institution or order.

instore
inside a store or shop

instratified
interstratified

instrinsic
Misspelling of intrinsic.

instructable
Capable of being instructed; receptive to instruction or education.

instructible
Capable of being instructed; teachable.

instructional
Intended for purposes of instruction, for teaching.
Relating to the teaching profession.

instructionals
plural of instructional

instructionless
Without instruction.

instructivist
Relating to instructivism

instructological
Of or pertaining to instructology

instructorial
Of or relating to instruction or instructors.

instructories
plural of instructory

instructorish
Characteristic of an instructor; didactic.

instructory
Of or relating to instruction; instructive; educational.

instrumentarial
Of or relating to an instrumentarium.

instrumentational
Relating to, or serving as, instrumentation

instrumentlike
Like an instrument.

insubduable
Alternative form of unsubduable.

insubmergible
Not capable of being submerged; buoyant.

insubmersible
Unable to be submerged; not submersible.

insubmissive
Unwilling to submit; not submissive, disobedient

insubordinate
Rebellious or defiant to authority; contumacious.

insubordinated
not subordinated

insubstantiable
Unable to be substantiated.

insubstantial
Lacking substance; not real or strong.

insubstantiated
Alternative form of unsubstantiated.

insubstantive
Not substantive (in any sense)
Unable to be substantiated; unfounded

insubvertible
That cannot be subverted.

insucken
The multure paid by occupiers of thirled lands for the service of grinding.

insuckens
plural of insucken

insudative
Not sudative

insufferable
Not sufferable; very difficult or impossible to endure; intolerable, unbearable.

insufficent
Misspelling of insufficient.

insulable
Capable of being isolated.

insulative
Serving to insulate.

insulatory
That acts as an insulator

insulinaemic
Alternative form of insulinemic.

insulinemic
Exhibiting insulinemia.

insulinergic
Produced or activated by insulin

insulinic
Relating to insulin

insulinlike
Resembling insulin or some aspect of it.

insulinogenic
Promoting the production of insulin.

insulinomimetic
That mimics the action of insulin

insulinomimetics
plural of insulinomimetic

insulinopenic
Relating to a form of diabetes mellitus that results from an inadequate secretion of insulin

insulinostatic
That keeps the concentration of insulin in the body static

insulinotrophic
Misspelling of insulinotropic.

insulinotropic
That stimulates the production, release and/or activity of insulin

insulostriatal
insular and striatal: relating to the brain's insula and striatum, especially their connectivity, both normal and abnormal.

insulous
Abounding in islands.

insultable
Capable of being insulted.

insultant
A consultant who is willing to criticise the organisation that they work for.

insultative
Insulting.
Misspelling of insulative.

insultive
Insulting.

insultory
that which insults or intends to insult

insultproof
Resistant to insults.

insunk
Sunk inward.

insuperable
Impossible to achieve or overcome or be negotiated.
Overwhelming or insurmountable.

insupportable
That cannot be tolerated or endured.
That cannot be supported; that cannot be demonstrated or proved. (of a statement, claim, argument, etc.)

insuppressible
That cannot be suppressed.

insurable
Capable of being insured