Meaning of “unaccustomed” in the English Dictionary

british dictionary

(Definition of “unaccustomed” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"unaccustomed" in American English

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unaccustomedadjective [ not gradable ]

us /ˌʌn·əˈkʌs·təmd/

(of a person) not familiar with or experienced at something:

She was unaccustomed to driving in heavy traffic.

Unaccustomed can also mean unusual or unexpected:

His unaccustomed nervousness made us all anxious.

(Definition of “unaccustomed” from the Cambridge Academic Content Dictionary © Cambridge University Press)