leery, mistrustful, suspicious, untrusting, wary (adj)

openly distrustful and unwilling to confide

fishy, funny, shady, suspect, suspicious (adj)

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"

suspicious (Adjective)

Arousing suspicion.

suspicious (Adjective)

distrustful or tending to suspect.

suspicious (Adjective)

Expressing suspicion