questionable
ques-tion-a-ble
adjective
Of doubtful honesty, legality, or moral propriety; open to dispute or suspicion.
"His business practices are highly questionable."
Thesaurus
Synonyms: refutable, deniable, confutative, confutable, soi-disant, so-called, in question, debatable, dubitable, fishy, funny, suspicious
Antonyms: unquestionable