OF WHAT BEFELL DON QUIXOTE WITH A DISCREET GENTLEMAN OF LA MANCHA Don Quixote pursued his journey in the high spirits, satisfaction, and self-complacency already described, fancying himself the most valorous knight-errant of the age in the world because of his late victory.
There are no more uses of "complacent" in the book.
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He had become complacent after years of success.
This team could win State if they stay hungry instead of getting too complacent.