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Synonyms
in·va·lid1 (ĭńvə-lĭd)

[From invalid2 (influenced by French invalide, sickly, infirm).]

noun 

One who is incapacitated by a chronic illness or disability.

adjective 

  1. Incapacitated by illness or injury.
  2. Of, relating to, or intended for invalids.

transitive verb: -lid·ed, -lid·ing, -lids. 

  1. To incapacitate physically.
  2. Chiefly British To release or exempt from duty because of ill health: “I was not quite sick enough to be invalided out, even though I was of no more use” (Mary Lee Settle)
in·val·id2 (ĭn-văĺĭd)

[Latin invalidus, weak, in-, not; see in–1, + validus, strong (from valēre, to be strong; see wal-).]

adjective 

  1. Not legally or factually valid; null: an invalid license.
  2. Falsely based or reasoned; faulty: an invalid argument.

derivatives

ińva·lid́i·ty
noun
in·vaĺid·ly
adverb