UNASSUETUDE

\ʌnɐsjˈuːətjˌuːd], \ʌnɐsjˈuːətjˌuːd], \ʌ_n_ɐ_s_j_ˈuː_ə_t_j_ˌuː_d]\
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  • un-as'w[=e]-t[=u]d, n. unaccustomedness.
1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson