stick-in-the-mudinformaldisapproving
wet blanketdisapproving
SMART Vocabulary: related words and phrases
People who are boring and old-fashioned
bore
buzzkill
Colonel Blimp
crashing bore
dinosaur
drip
fogey
fun sponge
grind
has-been
killjoy
Luddite
normcore
spod
spoilsport
square
stick-in-the-mud
stuffed shirt
uncharismatic
yawn