Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: , present participle of complacere 'to please greatly', from com- ( COM-) + placere 'to please'

complacent

 adjective
     
com‧pla‧cent
pleased with a situation, especially something you have achieved, so that you stop trying to improve or change things - used to show disapproval:
There's a danger of becoming complacent if you win a few games.
a complacent attitude towards the problem
complacent about
We simply cannot afford to be complacent about the future of our car industry.
—complacently adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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