stuffily

Adverb

1. In a poorly ventilated and close manner.
   • Perhaps, indeed, it was one of their best qualities that they spent the greater part of their time stuffily indoors. - 1895, Kenneth Graham, The Golden Age, London, page 3:
2. In a boring and pompous manner.
   • a stuffily tedious lecture on art
3. In an angry and obstinate manner.