Definition of "stuffy"

Poorly ventilated; partially plugged.  examples

Stout; mettlesome; resolute.  examples

(US) Angry and obstinate; sulky.  examples

Boring, uninteresting, over-formal, pompous, very conventional.  examples

(Scotland) Stout; sturdy.  examples

(US, Canada, colloquial, often childish) Synonym of stuffed toy  examples