Complacent
/kəˈmpleɪsənt/
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Definition
(adj) Uncritically satisfied with oneself or one's achievements; smug.
Sentence Examples
The coach urged his team not to be complacent following their four consecutive wins.
If you knew what I knew, you wouldn't be so complacent.
CEFR Practice Quiz
We cannot afford to be randomly ____ while our fierce rivals improve.