noun
a feeling of excessive pride or self-satisfaction
adjective
smug (having or showing an excessive pride in oneself or one's achievements)
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Her smugness was evident as she presented her flawless argument in the meeting.
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He couldn't help but show off his new car with a look of pure smugness on his face.
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She had a real 'holier-than-thou' attitude, full of smugness.
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The cat looked at me with smugness after catching a mouse in the house.