How to say "conspiracy" in Japanese

• 共謀きょうぼうCommon
  noun, suru verb, transitive verbThe most direct equivalent for 'conspiracy' in the sense of secretly planning something illegal together with others; it covers both the act of conspiring and collusion between parties.
• 結託けったくCommon
  noun, suru verb, intransitive verbCovers conspiracy and collusion in the sense of parties banding together, often with a suggestion of two or more groups or factions combining forces for a shared, usually improper, aim.
• 謀議ぼうぎCommon
  noun, suru verb, transitive verbUsed for conspiracy as secret deliberation—the act of conferring privately to hatch a plot; it also carries the senses of 'plot' and 'conference'.
  彼かれは絶対ぜったいにその謀議ぼうぎに加担かたんしていなかった。反はん政府せいふの悪わるだくみがあったのは、彼かれではなくて、その兄あにだった。↗

  He has had absolutely no part in the conspiracy; it was not he, but his brother, who had an axe to grind against the government.
• 加担かたんCommon
  noun, suru verb, intransitive verbNot really 'conspiracy' itself: it means support, assistance, or participation in someone else's undertaking, so it fits 'complicity'—backing or aiding a plot rather than being its ringleader.
  外国がいこく勢力せいりょくに加担かたんするスパイ活動かつどうにたずさわるならば、あなたは祖国そこくを裏切うらぎることになる。↗

  If you engage in espionage for a foreign power, you are selling your country down the river.
• 企みたくらみCommon
  nounBest for 'plot' or 'scheme' as a plan or design someone has conceived, not necessarily involving others; a conspiracy in the everyday sense of 'there's a scheme afoot' rather than a legal charge.
  彼女かのじょはそのたくらみに加くわわったことを否定ひていした。↗

  She denied having taken part in the scheme.

Use 共謀 or 結託 for conspiring or colluding with others, 謀議 for plotting secretly together, 加担 for complicity as backing or aiding, and 「企み」 for a scheme or plot as a thing conceived.

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

• 共謀きょうぼうconspiracy
• 結託けったくconspiracy
• 謀議ぼうぎplot
• 加担かたんsupport
• 企みたくらみplot
• 共同謀議きょうどうぼうぎconspiracy
• 密謀みつぼうconspiracy
• 謀計ぼうけいconspiracy
• 馴れ合いなれあいcollusion
• 悪巧みわるだくみwiles
• 共謀罪きょうぼうざい(criminal) conspiracy
• 陰謀いんぼうconspiracy