unventilated

US /ʌnˈven.t̬əl.eɪ.t̬ɪd/
UK /ʌnˈven.t̬əl.eɪ.t̬ɪd/
1.

換気されていない

If a space is unventilated, fresh air cannot enter and move around it:

:
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The heat in the unventilated office soon became unbearable.