VALID Synonyms: 112 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/valid
WEBSynonyms for VALID: logical, reasonable, coherent, rational, good, sensible, analytical, analytic; Antonyms of VALID: invalid, unreasonable, weak, irrational, illegitimate, illogical, unsound, incoherent.
DA: 53 PA: 100 MOZ Rank: 78