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Definition of unsubstantiated

unsubstantiated

/ˌʌnsəbˈstænʃieɪtɪd/
un · sub · stan · ti · at · ed
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unsubstantiated Lexical Profile

unsubstantiated Game Scores & Validity

• adjective

1

Not supported or proven by evidence, facts, or verification.

Example

"The investigative committee dismissed the rumor as an unsubstantiated claim."

Synonyms
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Antonyms
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• Rhymes for unsubstantiated

• Nearby Words

unsubscribe
unsubscriber
unsubsidized
unsubstantiated
unsubtle
unsubtly
unsuccessful

Word Origin & Etymology

Formed in the early 19th century by adding the privative prefix 'un-' to 'substantiated', the past participle of 'substantiate', which derives from Medieval Latin 'substantiatus' (from Latin 'substantia', meaning 'substance' or 'essence').

Cite this Entry

Wordmom. (2026). Definition of Unsubstantiated. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/unsubstantiated
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