noun
a person who is habitually gloomy or sullen
adjective
having a gloomy or sullen disposition
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The boss was often referred to as a sourpuss due to his constant frowning and negative attitude.
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Don't be such a sourpuss, lighten up and enjoy the party!
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Why are you being such a sourpuss? Chill out and have some fun.
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Her face scrunched up in a sourpuss expression as she tasted the bitter lemon.