Etymology
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unaccustomed (adj.)

1520s, "not customary, unfamiliar," from un- (1) "not" + past participle of accustom (v.). Meaning "not accustomed or habituated" (to) is first attested 1610s (see accustomed).

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Definitions of unaccustomed

unaccustomed (adj.)
unusual or unfamiliar;
a new budget of unaccustomed austerity
many varieties of unaccustomed foods
an unaccustomed pleasure
From wordnet.princeton.edu