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Synonyms
baseless, foundationless, groundless, invalid, unfounded, unreasonable, unsubstantiated, unsupported, unwarranted
Antonyms
good, hard, just, justified, reasonable, reasoned, substantiated, valid, well-founded, well-grounded
1803, in the meaning defined above
More from Merriam-Webster on nonvalid
Thesaurus: All synonyms and antonyms for nonvalid
See Definitions and Examples
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