opportunist
op·por·tu·nist
noun
1.
a person who places expediency above principle
adjective
1.
taking immediate advantage, often unethically, of any circumstance of possible benefit
Origin
From French opportuniste, equivalent to opportune + -ist.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.