What is the opposite of 'invalid'?

Antonyms for INVALID: healthy, well, binding, good, valid, accurate, correct, errorless, exact, factual, precise, proper, right, sound, true, valid, veracious, logical, rational, reasonable, sound, valid, well-founded, well-grounded, good, hard, just, justified, reasonable, reasoned, substantiated, valid, well-founded, well-grounded, etc.

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