unaccustomed

adjective

un·​ac·​cus·​tomed ˌən-ə-ˈkə-stəmd 

1

: not customary : not usual or common

2

: not habituated

—usually used with to

unaccustomedly

ˌən-ə-ˈkə-stəmd-lē 

adverb

Synonyms

• unacclimated
• unadapted
• unadjusted
• 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

Horses aren’t unaccustomed to starting gates, but Derby horses are only 3 years old; many have only raced a handful of times. —Dana O'Neil, New York Times, 3 May 2025

Cleveland is one of the NFL teams that frequently gets snow games, which is something that Gabriel is unaccustomed to. —Thomas G. Moukawsher, MSNBC Newsweek, 26 Apr. 2025

The study added that to observe the chimpanzees, researchers had to hide cameras in three locations because the wild chimps are unaccustomed to humans. —Rachel Raposas, People.com, 22 Apr. 2025

This significant drop in temperature not only affects daily life but also raises concerns about the potential for snow in regions unaccustomed to wintry weather. —Michael Gfoeller and David H. Rundell, Newsweek, 16 Jan. 2025

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