Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun invalid

1 sense of invalid

Sense 1
invalid, shut-in -- (someone who is incapacitated by a chronic illness or injury)
       => sick person, diseased person, sufferer -- (a person suffering from an illness)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb invalid

2 senses of invalid

Sense 1
invalid -- (force to retire, remove from active duty, as of firemen)
       => remove -- (remove from a position or an office)

Sense 2
disable, invalid, incapacitate, handicap -- (injure permanently; "He was disabled in a car accident")
       => injure, wound -- (cause injuries or bodily harm to)

Antonyms of adj invalid

2 senses of invalid

Sense 1
invalid (vs. valid) -- (having no cogency or legal force; "invalid reasoning"; "an invalid driver's license")

valid (vs. invalid) -- (well grounded in logic or truth or having legal force; "a valid inference"; "a valid argument"; "a valid contract")
        => binding -- (executed with proper legal authority; "a binding contract")
        => legal, sound, effectual -- (having legal efficacy or force; "a sound title to the property")
        => legitimate, logical -- (based on known statements or events or conditions; "rain was a logical expectation, given the time of year")
        => reasoned, sound, well-grounded -- (logically valid; "a sound argument")
        => validated -- (declared or made legally valid; "a validated claim")

Sense 2
invalid -- (no longer valid; "the license is invalid")

INDIRECT (VIA expired) -> unexpired -- (not having come to an end or been terminated by passage of time; "elected to fill the senator's unexpired term"; "an unexpired driver's license")

Similarity of adj invalid

2 senses of invalid

Sense 1
invalid (vs. valid) -- (having no cogency or legal force; "invalid reasoning"; "an invalid driver's license")
       => bad, uncollectible -- (not capable of being collected; "a bad (or uncollectible) debt")
       => fallacious, unsound -- (containing or based on a fallacy; "fallacious reasoning"; "an unsound argument")
       => false -- (erroneous and usually accidental; "a false start"; "a false alarm")
       => invalidated, nullified -- (deprived of legal force)
       => null, void -- (lacking any legal or binding force; "null and void")
       => sophistic, sophistical -- (plausible but misleading)
          Also See-> illegitimate#2

Sense 2
invalid -- (no longer valid; "the license is invalid")
       => expired (vs. unexpired) -- (having come to an end or become void after passage of a period of time; "an expired passport"; "caught driving with an expired license")