complacent
Concise Oxford English Dictionary © 2008 Oxford University Press:
complacent /kəmˈpleɪs(ə)nt/
▶adjective smug and uncritically satisfied with oneself or one's achievements.
– derivatives
complacency (also complacence) noun,
complacently adverb.
complacency (also complacence) noun,
complacently adverb.
– origin C17 (earlier (ME) as complacence), in the sense ‘pleasant’: from L. complacent-, complacere ‘to please’.
usage: The words complacent and complaisant are sometimes confused: complacent means ‘smug and self-satisfied’, whereas complaisant means ‘willing to please’.
'complacent' also found in these Oxford entries:

