YOU can add THE prefixes un-, in-, in-, Dis-, ir-, and il- to many adjectives to give THE oposite meaning.
Uninteresting , impossible , inexpensive , dishonest , irregular , illogical.

THE Most common of these prefixes are un-, im- and in-. Write THE opposite of these adjectives by adding un-, im- or in-.

Certain, clear, patient, correct, friendly, kind, complete, happy, important, modest, perfect.