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

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

Just make sure that your concerns are well-founded and not based on assumptions or stereotypes. — Sherri Gordon, Parents, 21 July 2026

Gen Z’s concerns are well-founded—and echo warnings from leading AI experts and mounting management evidence. — Steve Denning, Forbes.com, 14 June 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