unsubstantiated Synonyms

uncorroborated without substantiation ill-founded unjustified unsupported unconfirmed unverified unproved ungrounded weak unwarranted untrue unofficial unjustifiable unproven without merit formularized untested unmeritorious unexcused unestablished unendorsed uncertified unauthenticated unattested unsound unreliable unreasoned hypothetical groundless foundationless flimsy false fallacious dubious doubtful conjectural conceptive baseless illogical irrational unreasonable unfounded theoretical theoretic suspect spurious speculative specious shaky