opportunism

[op-er-too-niz-uhm, -tyoo-]
noun
1.
the policy or practice, as in politics, business, or one's personal affairs, of adapting actions, decisions, etc., to expediency or effectiveness regardless of the sacrifice of ethical principles.
2.
action or judgment in accordance with this policy.

Origin:
1865–70; < Italian opportunismo, equivalent to opportun(o) (< Latin opportūnus; see opportune) + -ismo -ism

opportunist, noun
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World English Dictionary
opportunist (ˌɒpəˈtjuːnɪst)
 
n
1.  a person who adapts his actions, responses, etc, to take advantage of opportunities, circumstances, etc
 
adj
2.  taking advantage of opportunities and circumstances in this way
 
oppor'tunism
 
n

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Word Origin & History

opportunism
1870, from opportune + -ism. Borrowed from It. opportunismo, a word in Italian politics.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
My only problem with this speech of his is that he built his fortune on
  opportunism, not the needs of the poor.
As such, polar bears provide an excellent example of evolutionary opportunism
  within a widespread mammalian lineage.
Some of it also appears as cynical political opportunism.
That's a journey from mere opportunism to pathological hypocrisy, a trip that
  only the boldest flip-floppers ever dare make.
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