V2 Vocabulary Building Dictionary
Definition: based on solid evidence or good reasons
Synonyms: valid, reasonable, solid, sound, cogent, well-grounded
Antonyms: unsound, insubstantial, unreasonable, invalid
Tips: When something is well-founded, it is based on facts or solid evidence. Used after a verb, it is not hyphenated. See usage examples.
My boss threatened to fire me unless I had a well-founded reason for being late for work again. (valid, reasonable)
The judge didn't feel that the evidence was well founded and dismissed the case. (valid, sound)
Jenny had some well-founded suspicions that her roommate was stealing money from her. (reasonable, valid)
None of the evidence was well founded, and the police had no choice but to let the suspect go. (solid, sound, valid)
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