spoilsport
UK: /ˈspɔɪl.spɔːt/ | US: /ˈspɔɪl.spɔːrt/
n. a person who ruins the enjoyment or pleasure of others by being overly negative or disapproving.
The word "spoilsport" emerged in the early 19th century, combining "spoil" (from Old French espoillier, meaning "to plunder or ruin") and "sport" (from Old French desport, meaning "leisure or amusement"). The term vividly captures someone who "ruins the game" by dampening fun or enthusiasm, often through rigid adherence to rules or pessimism. Its formation reflects a straightforward, descriptive logic—literally, one who "spoils the sport."
Don’t be a spoilsport—join us for the party!
He criticized our harmless prank and earned a reputation as a spoilsport.
The teacher acted like a spoilsport by canceling the field trip.
She didn’t mean to be a spoilsport; she was just worried about safety.
Nobody likes a spoilsport who complains during games.