(v)distrust, mistrust, suspectregard as untrustworthy; regard with suspicion; have no faith or confidence in“I suspect her true motives”, “she distrusts her stepmother”
(s)fishy, funny, shady, suspect, suspiciousnot 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”