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JLPT N1 Grammar

べからず

N1Obligation

N1 · Obligation · verb辞书形 + べからず / する → すべからず

must not; do not

verb辞书形 + べからず / する → すべからず

べからず is a formal written prohibition meaning “must not.”

It appears in signs, rules, and formal writing, not ordinary conversation.

関係者以外、この部屋に入るべからず。

Unauthorized persons must not enter this room.

Do not replace conversational してはいけない with it; it is very stiff.

Think of べからず as the “do not” on a formal sign.

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