Synonyms of dubitable

2 Syllables
dubious, chancy, clouded, iffy, doubtful, unclear, fishy, shady
3 Syllables
unsure, unproven, suspicious, doubtable, uncertain
4 Syllables
questionable, debateable, controversial, borderline, equivocal, problematic, unconfirmed
5 Syllables
unsubstantiated, controvertible, problematical, inconclusive, indecisive
6 Syllables
indeterminate