[ kəm'pleɪs(ə)nt ]
■ adjective smug and uncritically satisfied with oneself or one's achievements.
Derivatives
complacency (also complacence ) noun
~ly adverb
Origin
C17 (earlier (ME) as complacence ), in the sense 'pleasant': from L. ~- , complacere 'to please'.
Usage
The words ~ and complaisant are sometimes confused: ~ means ‘smug and self-satisfied’, whereas complaisant means ‘willing to please’.