Strongly forbidden with

Grammar: Prohibition » 〜べからず

Add べからず to a verb to issue a formal, old-fashioned prohibition. It still appears on signs, though 禁止(きんし) is more common.

Usage Notes

When modifying a noun, べからざる is used.

Further Reading

Related Grammar

  • Should not do with 〜てはいけない
    • Used to discourage (rather than prohibit) an action.
  • Must not do with 〜てはだめだ
    • Used to prohibit (rather than simply discourage) an action.

Examples

Doing as you please is strictly forbidden with 〜べからず

Learn the meaning and usage of the grammar 〜べからず in Japanese, with examples from manga.
くノ一ツバキの胸の内 » Volume 1 » Page 106

Sazanka sneaks out of class, leaving the teacher to send Asagao to bring her back. As Asagao chases Sazanka across the rooftops near the upper grade classroom, Tsubaki spots them. She meets them up on the roof and recites the school’s first rule.

ツバキ:
「ひとつ。無断(むだん)勝手(かって)行動(こうどう)をとるべからず。」
“One: Doing as you please without permission is strictly forbidden.”