Killjoy
ahd-5
noun.
One who spoils the enthusiasm or fun of others.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
A person who is anti-fun, or prevents others from having
fun
Word Usage
"The killjoy has been the fear that inflation is bubbling out of control."
cross-reference
bust someone's bubble
cold fish
dampener
damper
make waves
Synonym
Words with the same meaning
Cassandra
Eeyore
calamity howler
crepehanger
cynic