noun
preconception; prejudice; preoccupation
A fixed idea or bias formed before knowing the facts; often used in contexts of unfair judgment or mental preoccupation.
先入見を持たずに話を聞くことが大切だ。
It's important to listen without preconceptions.
彼の意見は先入見に基づいている。
His opinion is based on prejudice.
先入観 is a more common synonym with nearly identical meaning; 先入見 is less frequent but interchangeable in many contexts.
Compound of 先入 (sennyū, 'entering beforehand') and 見 (ken, 'view'). The exact historical derivation is uncertain, but the word is conventionally associated with the idea of a pre-existing view.