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English definition of “opportunist”

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opportunist

noun [C]  /ˌɑp·ərˈtu·nɪst/ disapproving us  
a person who takes advantage of every chance for success without thinking about the effects on other people: There will always be opportunists ready to play on the public’s fears and prejudices.
opportunistic
adjective  /ˌɑp·ər·tuˈnɪs·tɪk/ us  
Our team was pretty opportunistic and took advantage of some mistakes.
(Definition of opportunist from the Cambridge Academic Content Dictionary © Cambridge University Press)
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