adjective
having or showing smug or unwarranted satisfaction with oneself or one's achievements
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The self-complacent CEO failed to see the flaws in his company's strategy.
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She's always so self-complacent, thinking she's better than everyone else.
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Don't be so self-complacent, you still have a lot to learn.
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His self-complacent attitude was like a thick fog, clouding his judgment and preventing him from seeing the truth.