Synonyms of unsubstantiated
- 2 Syllables
- dubious, iffy, doubtful, fishy, suspect
- 3 Syllables
- theoretic, baseless, arguable, unfounded, suspicious, uncertain
- 4 Syllables
- apocryphal, controversial, conceptive, debatable, ideational, disputable, dubitable, unconfirmed, theoretical, foundationless, unsupported
- 5 Syllables
- speculative, formularized, indefinite
- 6 Syllables
- uncorroborated, unauthenticated