stuff·y 
(stŭfē)
(stŭfē)adj. stuff·i·er, stuff·i·est
1. Lacking sufficient ventilation; close.
2. Having the respiratory passages blocked: a stuffy nose.
3.
a. Dull and boring: a stuffy lecture.
b. Rigidly adhering to conventional standards; strait-laced: "I went to one stuffy upper class dinner party on my first night & I go to another tonight" (Evelyn Waugh).
stuffi·ly adv.
stuffi·ness n.