invalid - definition and synonyms

noun [countable] 

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/ˈɪnvəlɪd/
singularinvalid
pluralinvalids
  1. someone who is ill or injured and is unable to look after themselves

    He had been an invalid for many years.

    1. a.
      [only before noun] relating to someone who is ill or injured, especially permanently

      He lives with his invalid mother.