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Synonyms

well-founded

American  
[wel-foun-did] / ˈwɛlˈfaʊn dɪd /

adjective

  1. having a foundation in fact; based on good reasons, information, etc..

    well-founded suspicions.


well-founded British  

adjective

  1. having good grounds

    well-founded rumours

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of well-founded

Middle English word dating back to 1325–75

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.

It was for “history” that Freidenberg composed these notes, although she had well-founded doubt that they would be preserved.

From The Wall Street Journal • Apr. 24, 2026

But most current estimates of future inflation fall within a narrow range, giving us at least some confidence that the real yields based on those estimates are well-founded.

From MarketWatch • Apr. 8, 2026

To be eligible for asylum, a non-citizen had to demonstrate a well-founded fear of persecution in their home country due to their race, religion, nationality, membership in a particular social group, or political opinion.

From Los Angeles Times • Mar. 24, 2026

It encapsulates the well-founded belief that starting a war is likely to create unforeseen evils greater than the evil of the status quo.

From Salon • Mar. 14, 2026

To insist that the issue of validity must be separated from the issue of credibility is to insist that well-founded beliefs be treated as if they are unfounded beliefs.

From "The Invention of Science" by David Wootton

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