unaccustomed

adjective

un·​ac·​cus·​tomed ˌən-ə-ˈkə-stəmd 

1

: not customary : not usual or common

2

: not habituated

—usually used with to

unaccustomed to the heat

unaccustomedly

ˌən-ə-ˈkə-stəmd-lē 

adverb

Synonyms of unaccustomed

• unused

Examples of unaccustomed in a Sentence

They responded to our request with unaccustomed speed.

pampered youngsters who were unaccustomed to such hard work

Recent Examples on the Web

Parker said the piranha wouldn't have survived in Pennsylvania waters for very long, out of its natural habitat, and likely unaccustomed to the survival skills needed for the wild after living as a pet. — ABC News, 12 Aug. 2026

Disaster can strike in regions unaccustomed to their fury, as North Carolinians in the western end of the state painfully learned in 2024 as Hurricane Helene deluged the region. — Jamie Gold, Forbes.com, 28 July 2026

Part of the high-wire act of such books is that the authors and their publishers work at unaccustomed speed to provide the end product with a history-as-it-is-happening varnish. — David Remnick, New Yorker, 23 June 2026

Some kitchen staff members at schools receiving the free fillets are unaccustomed to handling and preparing raw fish. — Joe Hernandez, NPR, 23 May 2026

Word History

First Known Use

1526, in the meaning defined at sense 1

Rhymes for unaccustomed

• accustomed

Kids Definition

unaccustomed

adjective

un·​ac·​cus·​tomed ˌən-ə-ˈkəs-təmd 

1

: unusual, unfamiliar

unaccustomed scenes

2

: not used to something : not accustomed

unaccustomed to travel