WordS beginning with prefix IN
Words beginning with prefix IR
Words beginning with prefix DIS
Words beginning with the prefixes IM or UN
Words beginning with prefix IL
100

Mad or crazy

insane

100

Off the subject, unrelated

Irrelevant

100

Ignore, showing no regard

Disregard
100

Impolite, indecent. Not proper

Improper

100

Lacking sense or clear reasoning.

Illogical

200

Not doing work well, not getting things finished

inefficient

200

Cannot be undone or altered

Irreversible

200

Rude and not demonstrating manners

Discourteous

200

Not sure

Uncertain

200

Forbidden by law, illegal

Illicit

300

Cruel. Showing no pity or kindness

Inhuman

300

Tempting and difficult to stay away from

Irresistible

300

Not having similarities, different

Dissimilar

300

Not helpful, not encouraging or approving or pleasing.

Unfavourable

300

Not in accordance with accepted standards or rules

Illegitimate

400

Not occurring often

Infrequent

400

Unable to be saved or corrected

Irredeemable

400

Chaotic and disorganised 

Disorderly

400

Flawed, faulty or incomplete

Imperfect

400

Unable to read or write

Illiterate

500

Difference in fairness, size, degree or circumstances. 

Inequality

500

Showing a lack of respect for people or things that are taken seriously.

Irreverent 

500

Not following rules, orders or instructions

Disobedient

500

Not likely to happen or be true. 

Improbable

500

Not clear enough to be read. **(NOT one of your assigned words but a word you should know.)

Illegible