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Related topics: Illness & disability invalid in‧va‧lid 2 / ˈɪnvəliːd, -lɪd $ -lɪd / noun MI someone who cannot look after themselves because of illness, old age, or injury I resented being treated as an invalid.
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Do not detach the coupon or your ticket will be invalid.When the council sought to evict him for non-payment of the extra rent he pleaded in defence that the resolution was invalid.Ackerman said the argument was invalid.2 WRONG/INCORRECT an argument, reason etc that is invalid is not based on true facts or clear ideas, and lacks good judgment OPP valid 3 if something you type into a computer is invalid, the computer does not recognize or accept it Filename in invalid format. ○○ adjective 1 USE something a contract, ticket, claim etc that is invalid is not legally or officially acceptable OPP valid Without the right date stamped on it, your ticket will be invalid.Validate ≠ invalidate From Longman Dictionary of Contemporary English invalid in‧val‧id 1 / ɪnˈvælɪd /