/ ˈstʌfi; NAmE / adjective ( stuff·ier , stuffi·est )
1.
( of a building, room, etc. ) warm in an unpleasant way and without enough fresh air :
a stuffy room
It gets very hot and stuffy in here in summer.
2.
( informal , disapproving ) very serious, formal, boring or old-fashioned :
a stuffy, formal family
plain, stuffy clothes
► stuffi·ness noun [ U ]