1. (adj)doubtful, dubious, dubitable, in question(p) open to doubt or suspicion Antonyms: certain(p), settled, sure, unquestionable
2. (adj)doubtful, dubious fraught with uncertainty or doubt Synonyms: tentative, in question(p), dubious, doubtful, dubitable Antonyms: certain(p), sure, unquestionable, settled
3. (adj)doubtful, tentative unsettled in mind or opinion Synonyms: dubitable, probationary, tentative, provisionary, doubtful, in question(p), provisional, dubious Antonyms: sure, settled, unquestionable, certain(p)
Synonyms, Thesaurus & Antonyms of 'doubtful'
English Synonyms and Antonyms
1. doubtful Equivocal (L. equus, equal, and vox, voice, word) denotes that which may equally well be understood in either of two or more ways. Ambiguous (L. ambi, around, and ago, drive, lead) signif Synonyms: equivocal, ambiguous, enigmatical, indistinct, questionable, doubtful, indefinite, obscure, suspicious, dubious, indeterminate, perplexing, uncertain, enigmatic Antonyms: certain, evident, lucid, perspicuous, unequivocal, clear, indisputable, manifest, plain, unquestionable, distinct, indubitable, obvious, unambiguous, unquestioned
Synonyms for doubtful 
