unventilated

/ʌnˈvɛntɪleɪtɪd/
adjective
  1. Not having fresh air circulating; lacking ventilation.
    • Working in an unventilated room can make you feel drowsy.
    • The unventilated basement smelled musty and damp.
    • The old classroom was unventilated, so it got very stuffy in the afternoon.
Antonyms
What does "unventilated" mean? | whatsthatwordmean | whatsthatwordmean