I-adjective (keiyoushi)suspicious; doubtful; dubious; questionable; fishy

Na-adjective (keiyodoshi)quizzical; puzzled; inquisitive; suspicious; doubtful

Godan verb with 'ru' ending, Intransitive verbto wonder; to puzzle oneself about; to feel anxious about; to suspect; to doubt

Godan verb with 'mu' ending, Transitive verbto be suspicious of; to be doubtful of; to be dubious of