unfounded

[uhn-foun-did] / ʌnˈfaʊn dɪd /

ADJECTIVE

not based on fact

Synonyms

STRONGEST

baseless deceptive fabricated false gratuitous groundless illogical misleading spurious unjustified unproven unsubstantiated untrue untruthful unwarranted

WEAK

fallacious foundationless idle mendacious off-base trumped-up uncalled-for unreal vain without basis without foundation

Antonyms

STRONGEST

called-for correct genuine honest justified real reasonable right true truthful warranted

WEAK

founded proven substantiated supported

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

This is completely unfounded both medically and scientifically.

From BBC • Apr. 5, 2026

Analysts say the claims were unfounded and he acted out of anxiety about the armed forces' waning influence.

From Barron's • Apr. 3, 2026

Election experts, voting rights advocates, local elections officials and other California leaders have all dismissed those claims as unfounded and inaccurate.

From Los Angeles Times • Mar. 31, 2026

The attention on her and her family had included scandalous and unfounded accusations, she said.

From The Wall Street Journal • Mar. 24, 2026

Joe learned everything true and untrue, founded and unfounded, every ugly conjecture.

From "East of Eden" by John Steinbeck

Vocabulary lists containing unfounded

Fake It 'Til You Make It: Synonyms for "False"

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100 SAT Words Beginning with "U"

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"Laws are not the only way to boost immunization”: an editorial from Nature

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