Antonyms of adj fain

1 sense of fain

Sense 1
disposed (predicate), fain, inclined (predicate), prepared -- (having made preparations; "prepared to take risks")

INDIRECT (VIA willing) -> unwilling -- (not disposed or inclined toward; "an unwilling assistant"; "unwilling to face facts")

Similarity of adj fain

1 sense of fain

Sense 1
disposed (predicate), fain, inclined (predicate), prepared -- (having made preparations; "prepared to take risks")
       => willing (vs. unwilling) -- (disposed or inclined toward; "a willing participant"; "willing helpers")

Synonyms of adv fain

1 sense of fain

Sense 1
gladly, lief, fain -- (in a willing manner; "this was gladly agreed to"; "I would fain do it")