IPA: /ˈstʌfiər/
KK: /ˈstʌfiər/
Having a lack of fresh air or being overly warm and uncomfortable; more so than usual.
The room felt stuffier than it did yesterday, making it hard to breathe.
Stuffier → It is formed from "stuff" (from Middle English *stuf*, meaning material or substance) and the comparative suffix "-ier" (meaning more). The word "stuffier" means having more stuffiness or being more filled with material, often referring to a lack of air or freshness.
Think of 'stuff' as referring to material or substance, and remember that 'stuffier' means having more of that stuffiness, like being more cramped or less fresh.