Source : Webster's Revised Unabridged Dictionary (1913)

Complacent \Com*pla"cent\, a. [L. complacens very pleasing, p.
   pr. of complacere; com- + placere to please: cf. F.
   complaisant. See {Please} and cf. {Complaisant}.]
   Self-satisfied; contented; kindly; as, a complacent temper; a
   complacent smile.

         They look up with a sort of complacent awe . . . to
         kings.                                   --Burke.

Source : WordNet®

complacent
     adj : contented to a fault; "he had become complacent after years
           of success"; "his self-satisfied dignity" [syn: {self-satisfied}]