Definition of complacent adjective from the Oxford Advanced American Dictionary

 

complacent

 adjective
adjective
NAmE//kəmˈpleɪsnt//
 
complacent (about somebody/something)(usually disapproving)
 
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too satisfied with yourself or with a situation, so that you do not feel that any change is necessary; showing or feeling complacency a dangerously complacent attitude to the increase in unemployment We must not become complacent about progress.
complacently
 
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adverb
See the Oxford Advanced Learner's Dictionary entry: complacent