1550s, "full of stuff, full of substance" (obsolete); 1831 as "poorly ventilated;" from stuff (n.) + -y (2). Sense of "pompous, smug" is from 1895. Related: Stuffily; stuffiness.
hot and stuffy and the air was blue with smoke
a stuffy feeling in my chest
studly
study
stuff
stuffed
stuffing
stuffy
Stuka
stultification
stultify
stumble
stumblebum