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in- (ig-, il-, im-, ir-). (Latin: not, without; used as a prefix).

This in- becomes i- before gn; il- before l; im- before b and m; and ir- before r. Don't confuse this in- with another in-, that means "in, within," etc.

ignorance:
illegal:
illiterate:
imbalance:
immaculate:
immature:
immovable:
improbable:
inaccurate:
inactive:
incorrect:
irrational:
irregular: