Definition of unaccustomed adjective from the Oxford Advanced American Dictionary

     

    unaccustomed

     adjective
    adjective
    NAmE//ˌʌnəˈkʌstəmd//
     
    (formal)
     
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  1. 1unaccustomed to something/to doing something not in the habit of doing something; not used to something He was unaccustomed to hard work. I am unaccustomed to being told what to do.
  2. 2[usually before noun] not usual, normal, or familiar The unaccustomed heat made him weary. I was surprised by her unaccustomed silence. opposite accustomed
See the Oxford Advanced Learner's Dictionary entry: unaccustomed