unsubstantiated

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From un- +‎ substantiated.

unsubstantiated (comparative more unsubstantiated, superlative most unsubstantiated)

1. Lacking substantiation; without evidence.

   Synonyms: see Thesaurus:baseless

   • 2018, James Lambert, “Setting the Record Straight: An In-depth Examination of Hobson-Jobson”, in International Journal of Lexicography, volume 31, number 4, →DOI, page 487:

     Such hedging is necessitated by the lack of in-depth knowledge of the contents, which also gives free rein to the scripting of unsubstantiated factoids concerning the book.

From unsubstantiate +‎ -ed.

unsubstantiated

1. simple past and past participle of unsubstantiate

• “unsubstantiated”, in OneLook Dictionary Search.
• “unsubstantiated”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “unsubstantiated”, in Oxford Learner's Dictionaries