Meaning of “stuffy” - Learner’s Dictionary

stuffy

adjective uk us /ˈstʌfi/
AIR

If a room or a building is stuffy, it is hot and unpleasant and the air is not fresh.

FORMAL

old-fashioned, formal, and boring:

a stuffy club for wealthy old men

(Definition of “stuffy” from the Cambridge Learner’s Dictionary © Cambridge University Press)