disaccustomed

/ˌdɪsəˈkʌstəmd/
adjective
  1. No longer used to something; having lost the habit or familiarity of doing or experiencing something.
    • After years of living in a warm climate, she felt disaccustomed to the cold winter air.
    • The astronaut was disaccustomed to walking on Earth after months in zero gravity.
    • He was disaccustomed to waking up early after a long vacation.
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