noun
stereotype; preconceived idea; preconceived notion
Refers to a fixed, conventional idea or image that people hold, often without questioning it. Common in discussions about breaking free from old ways of thinking.
既成概念にとらわれずに新しい方法を考えよう。
Let's think of a new method without being bound by preconceived ideas.
彼の提案は既成概念を打ち破るものだった。
His proposal broke through stereotypes.