unsubstantiated Synonyms

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