Main entry: questionable
Definition: subject to question
Usage: questionable motives; a questionable reputation; a fire of questionable origin
Antonyms: unquestionable
Definition: incapable of being questioned
Antonyms: unambiguous, unequivocal, univocal
Definition: admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion
Main entry: confutable, confutative, questionable, refutable
Definition: able to be refuted
Antonyms: undeniable
Definition: not possible to deny