opportunist

Definition of Opportunist in English :

1. opportunist, self-seeker

a person who places expediency above principle

taking immediate advantage, often unethically, of any circumstance of possible benefit

WordNet Lexical Database for English. Princeton University. 2010.

Opportunist

noun

1.

a person who adapts his or her actions, responses, etc, to take advantage of opportunities, circumstances, etc

adjective

2.

taking advantage of opportunities and circumstances in this way

n.

One who takes advantage of any opportunity to achieve an end, often with no regard for principles or consequences.