Prefixes that make opposites

Un: Unhappy; Unstoppable; Untidy; Unlucky; Unimportant; Unable; Unafraid.

Im: Impossible; Impregnable.

Dis: Disorganized; Disappear; Dishonest; Disagree.

Ir: Irresponsible; Irregular; Irreparable; Irrefutable;

In: Indecisive; Incorrect; Incapable.

Il: Illogical; Illegal .

Mis: Misunderstand; Misinform; Miscalculate; Misdistribuition.