well-founded

adjective

well-found·​ed ˈwel-ˈfau̇n-dəd 

: based on excellent reasoning, information, judgment, or grounds

Synonyms of well-founded

• logical
• reasonable
• valid
• rational
• coherent
• good
• sensible

Examples of well-founded in a Sentence

even a well-founded argument can lead to an erroneous conclusion if one of the premises is incorrect

a well-founded complaint about the business's treatment of its customers

Recent Examples on the Web

But Veach’s hope that Reid incorporated at least some of his research report into the decision to draft Jackson seems well-founded in speaking with Reid. — Kansas City Star, 30 Sep. 2026

While the exec has plenty of reason to publicly project confidence, his characterization is well-founded in regulatory procedural norms. — Dade Hayes, Deadline, 9 Sep. 2026

Concerns about mental health deteriorating on these types of deployments are well-founded. — Christopher Buchanan, Los Angeles Times, 14 Aug. 2026

Many predicted this sort of mission-creep when VAR was in its infancy, and those warnings have proven well-founded. — Graham Scott, New York Times, 22 July 2026

Word History

First Known Use

1608, in the meaning defined above

Rhymes for well-founded

• abounded
• astounded
• compounded
• confounded
• expounded
• foregrounded
• impounded
• propounded
• rebounded
• resounded
• subrounded
• surrounded

Kids Definition

well-founded

adjective

well-found·​ed

-ˈfau̇n-dəd

: based on good reasons