[op-er-too-nist, -tyoo-]
a person who practices opportunism, or the policy of adapting actions, decisions, etc., to effectiveness regardless of the sacrifice of ethical principles: He is an extreme opportunist and always thinks the ends justify the means.
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World English Dictionary
opportunist (ˌɒpəˈtjuːnɪst)
1.  a person who adapts his actions, responses, etc, to take advantage of opportunities, circumstances, etc
2.  taking advantage of opportunities and circumstances in this way

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1881, from opportune + -ist. Borrowed from It. opportunismo, a word in Italian politics, later applied in French to Gambetta (1881) and then generally in English to any who seek to profit from the prevailing circumstances. Related: Opportunistic.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He is a hustler of sensibility, an opportunist of inspiration.
But his conduct in government has been opportunist and erratic.
The plant is considered a hardy opportunist and, left unchecked will outcompete
  native shrubs and trees.
Chalmers is a nitwit and an opportunist who steals ideas from others.
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