as in unreasonable
having no basis in reason or fact
a careful investigation proved that the charges were foundationless
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Recent Examples of Synonyms for foundationless
Adjective
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Those fears are not unreasonable, either, given the ability of AI to do so many things so well.
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Horn’s assessment wasn’t unreasonable; it was based on recent statements by Greenlandic politicians.
Adjective
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On the evening of June 2, his baseless case was further undercut when Republican Steve Hilton won the second spot on November’s ballot for governor, up against Democrat Xavier Becerra.
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Skepticism of elections flared up recently in California after Trump made a baseless claim that Democrats were cheating to defeat a Republican candidate for governor and another for Los Angeles mayor.
Adjective
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The lesion that was removed is from the part of the brain that causes moments of unfounded fear.
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The rumors, so far, have proved unfounded.
Cite this Entry
“Foundationless.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foundationless. Accessed 28 Jun. 2026.
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