Stories We Like: A Guide to the Comma
"poorly ventilated," 1831, from stuff (n.) + -y (2). Sense of "pompous, smug" is from 1895. Related: Stuffily; stuffiness.
Tediously conventional; pompous and self-righteous: He was inclined to be a bit stuffy in sexual matters
[1895+; fr stuffy, ''stale, lacking freshness,'' influenced by stuffed shirt]