deconditioned

/diːkənˈdɪʃənd/
adjective
  1. Having lost physical fitness, strength, or a conditioned response, typically due to inactivity or a change in environment.
    • After a month in bed, the patient was severely deconditioned and needed physical therapy.
    • The deconditioned muscles of the hiker made the steep trail much harder than expected.
    • Returning astronauts are often deconditioned and require a gradual reconditioning program.
Synonyms
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