unacclimatized

adjective
un·​ac·​cli·​ma·​tized | \ ˌən-ə-ˈklī-mə-ˌtīzd How to pronounce unacclimatized (audio) \

Definition of unacclimatized

: not adapted to a new climate, place, or situation : not acclimatized a hiker unacclimatized to high altitudes

First Known Use of unacclimatized

1863, in the meaning defined above

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