Negative prefixes in English (un-, in-, dis-, non-, im-, il-, ir-, a-, anti-) are added to the beginning of words to change them to the opposite or negative meaning. They are used across nouns, verbs, and adjectives to indicate a lack of something, opposition, or reversal of an action.
Un- (not/opposite): unhappy, unable, unfasten, unlock
In-(not): inactive, invisible
Im- (not): impossible, immoral, impatient
Il- (not): illegal, illogical, illiterate
Ir-(not): irregular, irrational, irresponsible
Dis- (not/opposite): dislike, disagree, dishonest, disconnect
Non- (not/neutral): Usually indicates a lack of something or a neutral "not" (e.g., nonprofit, nonsense, nonconformist
A- / An- (without/not): atypical, amoral, anarchy
Anti- (against/opposite): antisocial, antibiotic, anticlimax
De- (reverse/reduce): deactivate, decompose, deconstruct
Mis- (wrongly): misbehave, misunderstanding