Definition of せんにゅうかん
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(n) preconception; prejudice; preoccupation; preconceived notion
そういうの、先入観っていうんだよっ!体験したこと無いのに、決め付けるのはよくないっ!
That's what they call 'prejudice'! It's wrong to make your mind up on something you've never experienced!