"suspicious" in the adjective sense
1. leery, mistrustful, suspicious, untrusting, wary
openly distrustful and unwilling to confide
2. fishy, funny, 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"
Source: WordNet® (An amazing lexical database of English)
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