U0019300 (ŭn′ə-kŭs′təmd)adj.1. Not common or usual: "The legislature has produced a new budget of unaccustomed austerity"(People).2. Not being habituated. Used with to:is still unaccustomed to a life of stress.un′ac·cus′tomed·ly adv.
unaccustomedly
(ˌʌnəˈkʌstəmdlɪ) advin an unaccustomed mannerThesaurusSeeunaccustomed