- leery, mistrustful, suspicious, untrusting, wary - openly distrustful and unwilling to confide
Antonyms: trustful, trusting (indirect, via distrustful)
- fishy, funny, queer, shady, suspect, suspicious - not as expected; "there was something fishy about the accident"; "up to some funny business"; "some definitely queer goings-on"; "a shady deal"; "her motives were suspect"; "suspicious behavior"
Antonym: unquestionable (indirect, via questionable)