Longman Dictionary of Contemporary English homepage

complacency

 noun
     
com‧pla‧cen‧cy [uncountable]
a feeling of satisfaction with a situation or with what you have achieved, so that you stop trying to improve or change things - used to show disapproval:
Doctors have warned against complacency in fighting common diseases.
Despite yesterday's win, there is clearly no room for complacency if the team want to stay top of the league.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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