illicit = not lawful

illogical = not according to reason

half-hearted = not eager.

imaginary = (imagined),not real/(imagine=to form a picture in the mind/to believe without proof)

imaginary = (imagined) , not real / (imagine= to form a picture in the mind / to believe without proof)

immune = (free from) / not able to be attacked by, eg.I have had disease so am immune = — & so cannot be attacked by it again

impalpable = not able to be felt because so fine

impartial = not favouring one side / (just)

impertinent = not polite,  not showing proper respect

imperturbable = (calm) / not easily made angry or excited

impervious = not allowing to pass through, (eg. Rubber is impervious to liquid / He is impervious to reason=cannot be made to understand)

improvident = not looking to the future,(eg.not laying aside money for future needs)

Impudend = (rude) / not showing proper respect

inapt = not skillful/not concerned with the matter which is being talked about

incoherent = (of the expression of idea) in bad order, not well arranged / (of a person)unable to express his idea clearly)

incommensurable = (of two things) not able to be compared with each other, not able to be measured the one with the other / (compar=to set side by side & notice the sameness or difference)

incommensurate = not equal, not enough

incongruous = not suitable or suiting, not agreeing with,(eg.a lady hat on a man)

inconsequential = not following the natural order, not making sense,(eg.I am ill but it is raining)

inconsiderable = (small)/not worth nothing

incorrigible = not able to be set right or made to behave well/(hopelessly bad)

incredulous = (disbelieving), not willing to believe