noun
preconceived notion; stereotype; ready-made idea
Refers to fixed, unquestioned ideas or stereotypes one holds, often without direct experience. Common in critical or analytical contexts.
既成観念にとらわれずに、新しい発想を大切にしよう。
Let's value new ideas without being bound by preconceived notions.
彼の意見は既成観念に基づいているだけだ。
His opinion is just based on stereotypes.
Compound of 既成 (kisei, 'already formed, established') and 観念 (kannen, 'idea, notion'). The exact historical derivation is uncertain, but the term is a modern Sino-Japanese coinage.