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Synonyms

ill-founded

American  
[il-foun-did] / ˈɪlˈfaʊn dɪd /

adjective

  1. based on weak evidence, illogical reasoning, or the like.

    an ill-founded theory.


ill-founded British  

adjective

  1. not founded on true or reliable premises; unsubstantiated

    an ill-founded rumour

"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 ill-founded

First recorded in 1665–75

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.

"I have done nothing wrong or unlawful and the concerns raised by the Home Office against me are ill-founded."

From BBC • Dec. 16, 2024

She did not make any of these dangerous and ill-founded accusations in her relatively short speech Monday night.

From Los Angeles Times • Jul. 16, 2024

“The terminations in late 2020 were unrelated to the ill-founded concerns raised by the employees in 2019.”

From Washington Post • Oct. 6, 2022

That’s why it’s notable that even as the Belcher decision repudiated an ill-founded, punitive approach to teenage crime, Connecticut’s parole board adopted a humane alternative.

From New York Times • Apr. 20, 2022

If a castaway is injured, beware of well-meaning but ill-founded medical treatment.

From "Life of Pi" by Yann Martel