If you refer to someone's behaviour as opportunism, you are criticizing them for taking advantage of any opportunity that occurs in order to gain money or power, without thinking about whether their actions are right or wrong.
例句
The Energy Minister responded by saying that the opposition's concern for the environment was political opportunism.能源部长回应说，反对派对环境问题的关切是政治上的机会主义。
英汉词典释义
n.
<贬>机会主义,投机取巧
He was accused of commercial opportunism.人们指责他在商业上投机取巧。The fall of the old regime provided fertile ground for opportunism.旧政权的垮台为机会主义提供了成熟的时机。Opportunism consists of sacrificing fundamental interests in order to gain temporary,partial benefits.机会主义就是牺牲根本的利益,贪图暂时的、局部的利益。
英英词典释义
Noun
1. taking advantage of opportunities without regard for the consequences for others