名詞 opportunist:

1. a person who places expediency above principle
   同義詞：self-seeker

形容詞 opportunist:

1. taking immediate advantage, often unethically, of any circumstance of possible benefit
   同義詞：opportunistic, timeserving

1. One who conforms to the prevailing ways and opinions of one's time or condition for personal advantage; an opportunist.
   隨波逐流的人為了個人好處而認同自己所處時期或狀況中流行的方式或觀念的人; 機會主義者
2. There were many opportunists and few men of principle.
   機會主義者多，堅持原則的人絕無僅有。

op.por.tun.ist

n.（名詞）
One who takes advantage of any opportunity to achieve an end, often with no regard for principles or consequences.
機會主義者：指常不顧原則和后果而抓住一切機會追求自己利益的人

【引伸】
op.portun.ism
n.（名詞）