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complacent (adj.)

1650s, "pleasing," from Latin complacentem (nominative complacens) "very pleasing," present participle of complacere "be very pleasing" (see complacence). Meaning "pleased with oneself, self-satisfied" is from 1767. Sense of "civil, kindly, disposed to give pleasure" is from 1790. Related: Complacently.

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