Words related to suspicious apprehensive, careful, cautious, doubtful, incredulous, jealous, leery, mistrustful, skeptical, wary, watchful, dubious, questionable, uncertain, unsure, unusual, cagey, green-eyed, in doubt, questioning. The word suspicious describes someone who is cautious and watchful. This person might be checking to see if someone is following them, looking around suspiciously, or acting oddly.