Definitions

unsubstantiated

[uhn-suhb-stan-shee-ey-tid] / ˌʌn səbˈstæn ʃiˌeɪ tɪd /

ADJECTIVE

questionable, unproven

Synonyms

STRONGEST

debatable dubious unsupported

WEAK

arguable controversial disputable doubtful dubitable fishy hard to believe iffy indefinite open to doubt open to question suspect suspicious uncertain unconfirmed uncorroborated

Antonyms

STRONGEST

certain sure