Antonyms of adj used_to

1 sense of used to

Sense 1
used to (predicate), wont to (predicate) -- (in the habit; "I am used to hitchhiking"; "you'll get used to the idea"; "...was wont to complain that this is a cold world"- Henry David Thoreau)

INDIRECT (VIA accustomed) -> unaccustomed -- (not habituated to; unfamiliar with; "unaccustomed to wearing suits")

Similarity of adj used_to

1 sense of used to

Sense 1
used to (predicate), wont to (predicate) -- (in the habit; "I am used to hitchhiking"; "you'll get used to the idea"; "...was wont to complain that this is a cold world"- Henry David Thoreau)
       => accustomed (vs. unaccustomed) -- ((often followed by `to') in the habit of or adapted to; "accustomed to doing her own work"; "I've grown accustomed to her face")