Mad or crazy
insane
Off the subject, unrelated
Irrelevant
Ignore, showing no regard
Impolite, indecent. Not proper
Improper
Lacking sense or clear reasoning.
Illogical
Not doing work well, not getting things finished
inefficient
Cannot be undone or altered
Irreversible
Rude and not demonstrating manners
Discourteous
Not sure
Uncertain
Forbidden by law, illegal
Illicit
Cruel. Showing no pity or kindness
Inhuman
Tempting and difficult to stay away from
Irresistible
Not having similarities, different
Dissimilar
Not helpful, not encouraging or approving or pleasing.
Unfavourable
Not in accordance with accepted standards or rules
Illegitimate
Not occurring often
Infrequent
Unable to be saved or corrected
Irredeemable
Chaotic and disorganised
Disorderly
Flawed, faulty or incomplete
Imperfect
Unable to read or write
Illiterate
Difference in fairness, size, degree or circumstances.
Inequality
Showing a lack of respect for people or things that are taken seriously.
Irreverent
Not following rules, orders or instructions
Disobedient
Not likely to happen or be true.
Improbable
Not clear enough to be read. **(NOT one of your assigned words but a word you should know.)
Illegible