: not : in-, non-—in adjectives formed from adjectives
unambitiousunskilled
or participles
undressed
, in nouns formed from nouns
unavailability
, and rarely in verbs formed from verbs
unbe
—sometimes in words that have a meaning that merely negates that of the base word and are thereby distinguished from words that prefix in- or a variant of it (such as im-) to the same base word and have a meaning positively opposite to that of the base word
unartisticunmoral
2
: opposite of : contrary to—in adjectives formed from adjectives