UNACCUSTOMED
unaccustomed
(adjective) unusual or unfamiliar; “an unaccustomed pleasure”; “many varieties of unaccustomed foods”; “a new budget of unaccustomed austerity”
Source: WordNet® 3.1
Etymology
Adjective
unaccustomed (comparative more unaccustomed, superlative most unaccustomed)
Not used to an event or thing, not accustomed.
Verb
unaccustomed
simple past tense and past participle of unaccustom
Source: Wiktionary
Un`ac*cus"tomed, a.
1. Not used; not habituated; unfamiliar; unused; -- which to.
Chastened as a bullock unaccustomed to yoke. Jer. xxxi. 18.
2. Not usual; uncommon; strange; new.
What unaccustomed cause procures her hither Shak.
Source: Webster’s Unabridged Dictionary 1913 Edition