Synonyms of problematical

2 Syllables
vague, puzzling, dubious, cryptic, chancy, chancier, clouded, knottier, doubtful, unclear, knotty, muddy
3 Syllables
theoretic, unsure, tenebrous, unproven, obscure, opaque, uncertain
4 Syllables
questionable, enigmatic, borderline, debatable, unresolved, ideational, equivocal, problematic, dubitable, unconfirmed, theoretical, inexplicit, reticular
5 Syllables
controvertible, inconclusive, indecisive, indefinite, enigmatical
6 Syllables
unintelligible, indeterminate