先せん入にゅうせんにゅうFreq.FrequencyTop 100,000Meanings1nounpreconception; prejudicePrimarily used in the compound 先入観 (せんにゅうかん), meaning a preconceived idea or bias. Rarely used as a standalone noun.先せん入にゅう観かんを持もたずに話はなしを聞きいてください。Please listen without preconceptions.彼かれの意い見けんは先せん入にゅう観かんに基もとづいている。His opinion is based on prejudice.