ADJ.
tedious
VERB + STUFFILY
time
STUFFILY + NOUN
indoors
PREP.
on
adv
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.
In a boring and pompous manner.
a stuffily tedious lecture on art
In an angry and obstinate manner.
adverb — in a stuffy manner
i Register
In some senses, stuffily is marked as US. Watch for register when choosing this word.