decondition

de- +‎ condition

• (UK) IPA^(key): /diːkənˈdɪʃən/

decondition (third-person singular simple present deconditions, present participle deconditioning, simple past and past participle deconditioned)

1. (transitive) To adapt to a less demanding environment than that to which one was previously conditioned.

   Deconditioning due to decreased physical effort results in muscle loss, including heart muscles.

• conditioned