How to say "forbidden" in Japanese

• 禁断きんだんCommon
  no-adjectiveCovers 'forbidden' in an abstract, often dramatic sense — things prohibited by taboo or rule, as in forbidden love or forbidden fruit. It is not used for simple signs banning entry to a place.
  ふっ、禁断きんだんの魔術まじゅつとやらは、俺おれには通用つうようしないぜ！↗

  Hah, your 'forbidden magics' aren't going to work with me!
• 立ち入り禁止たちいりきんしCommon
  no-adjectiveMeans 'off-limits' or 'no entry': a specific area or place that people are forbidden to enter. Use it for physical locations marked off by signs or rules, not for abstract senses like forbidden love.
  この建物たてものは、現在げんざい立ち入り禁止たちいりきんしだ。↗

  This building is off limits now.

Use 禁断 for forbidden in an abstract or dramatic sense, as in forbidden love or forbidden fruit; use 「立ち入り禁止」 for places that are off-limits and entry into them is forbidden.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• ご法度ごはっとforbidden
• 禁断きんだんforbidden
• 立ち入り禁止たちいりきんしoff-limits
• 開かずのあかずのforbidden
• 無用むようprohibited