Pronunciation: /ˈkɪlˌdʒɔɪ/
noun a person who spoils the enjoyment of others, typically by being disapproving or overly serious
A1 My little brother is such a killjoy when he doesn't want to play with me.
A2 She always complains about the weather, she's such a killjoy.
B1 The teacher was seen as a killjoy by the students for giving them extra homework.
B2 Don't be a killjoy and let us have some fun at the party.
C1 His constant negativity and criticism make him a real killjoy in social situations.
C2 The manager's strict rules and regulations were viewed as killjoy by the employees.
formal The teacher was seen as a killjoy by the students because she always enforced strict rules.
informal Don't be such a killjoy and come join us for the party!
slang She's such a buzzkill, always being a killjoy at every gathering.
figurative His negative attitude was like a killjoy, sucking the energy out of the room.
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