opportunist

n. one who seizes opportunity (often without regard for principles)

adj. seizing opportunities (often without regard for principles or ethics)

Opportunism is a term used in politics and political science. It forms an important rationale as well for transaction cost economics. It is interpreted in different ways, but usually refers to one or more of the following:a political of aiming to increase one's political influence at almost any price, or a political style which involves seizing every and any opportunity to extend one's political influence, whenever such opportunities arise.the practice of abandoning in reality some important political principles that were previously held, in the process of trying to increase one's political power and influence.a trend of thought, or a political tendency, seeking to make political capital out of situations with the main aim being that of gaining more influence or support, instead of truly winning people over to a principled position or improving their political understanding.
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Noun
1. a person who places expediency above principle
(synonym) self-seeker
(hypernym) selfish person
(hyponym) backscratcher
Adjective
1. taking immediate advantage, often unethically, of any circumstance of possible benefit
(synonym) opportunistic, timeserving
(similar) expedient

n. opportunist, timepleaser, timeserver, one who seizes opportunity without regard for principles

n. opportunist, time server