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killjoy (noun) person who spoils otherís enjoyment or pleasure.
A person who does not allow others to have any enjoyment or pleasure is a killjoy. Killjoys cannot tolerate otherís joy. They destroy otherís pleasures.
- The stern teacher Mrs. Smith was a killjoy to her students, because she was very severe with them and wouldnít allow them play even a minute extra time.
- Tom the bully was a big killjoy to his classmates; he would not allow them to play or move about as they liked, and he always threatened them.