A stuffy room or building is unpleasant because it has no fresh air It was hot and stuffy in the classroom. Oppressive from lack of freshness
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See examples of stuffy used in a sentence.
Definition of stuffy adjective from the oxford advanced learner's dictionary
(comparative stuffier, superlative stuffiest) (of a building, room, etc.) warm in an unpleasant way and without enough fresh air It gets very hot and stuffy in here in summer. If it is stuffy in a place, it is unpleasantly warm and there is not enough fresh air
