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English definition of “opportunist”

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opportunist

noun [C] uk   /ˌɒp.əˈtjuː.nɪst/ us    /ˌɑː.pɚˈtuː-/ usually disapproving
someone who tries to get power or an advantage in every situation: He was portrayed as a ruthless opportunist who exploited the publicity at every opportunity.

opportunist

adjective [usually before noun] uk   /ˌɒp.əˈtjuː.nɪst/ us    /ˌɑː.pɚˈtuː-/ usually disapproving
using a situation to get power or an advantage: The burglary was probably carried out by an opportunist thief who noticed the door was open.
(Definition of opportunist from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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