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I am very complacent, and proud of myself for winning class president.
Complacently means satisfaction. A good sentence for this word would be, her complacently attitude almost made her lose the race.
Complacent= pleased, especially with oneself, advantages or situations
The girl was complacent with her performance knowing she will win the competition for sure.
The homophone for complacent is complaisant.
Your complacent sister is headed for an unpleasant awakening.