1. Lacking fresh air
   "hot and stuffy and the air was blue with smoke";
   - airless, close, unaired
    
2. Affected with a sensation of stoppage or obstruction
   "a stuffy feeling in my chest"
    
3. Excessively conventional and unimaginative and hence dull
   "why is the middle class so stuffy, so utterly without a sense of humour?";
   - stodgy, staid

Derived forms: stuffier, stuffiest

See also: button-down, buttoned-down [US, informal], conservative, conventional, obstructed, unventilated

Encyclopedia: Stuffy