noun
Refers to the attitude or principle of acting based on what is convenient or advantageous at the moment, often without regard for principles or long-term consequences.
彼の行動は単なる便宜主義だ。
His actions are nothing but opportunism.
その政策は便宜主義に基
That policy is based on expediency.
日和見主義 emphasizes waiting to see which way the wind blows before acting, while 便宜主義 focuses more on choosing the most convenient or advantageous course at the moment.
Compound of 便宜 (convenience, expediency) and 主義 (principle, doctrine).