noun
Selfishness is the quality of being selfish.
adjective
Selfish describes someone who is concerned only with their own interests and not caring about others.
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Her selfish behavior was evident when she refused to share the resources with her colleagues.
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He's so selfish, he never thinks about anyone else's feelings.
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Stop being so selfish and share the snacks with us!
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His selfish attitude was like a dark cloud overshadowing the group's harmony.