Translation guide
In Japanese, expressing 'secret plan' depends on the nuance: a hidden strategy, a surprise scheme, a conspiracy, or a confidential project. The most common and versatile word is 秘密計画 (himitsu keikaku), but other terms like 秘策 (hisaku) for clever schemes or 陰謀 (inbō) for sinister plots are also used. This guide covers natural ways to convey the idea.
A plan kept hidden from others, often for strategic or personal reasons.
The most direct and neutral translation. Suitable for both formal and casual contexts.
彼らは秘密計画を進めている。
They are proceeding with a secret plan.
I haven't told anyone about that secret plan yet.
Casual, often used for personal secrets or surprises among friends or family.
これは内緒の計画だから、誰にも言わないでね。
This is a secret plan, so don't tell anyone.
A cunning or ingenious plan, often in business, politics, or competition.
A secret plan or stratagem, implying cleverness. Common in business and strategic contexts.
社長は新製品の秘策を練っている。
The company president is devising a secret plan for the new product.
A secret plot or scheme, often with a negative connotation. Less common, more literary.
A secret plan by a group to do something harmful or illegal.
A conspiracy or plot, often with malicious intent. Used in political, historical, or dramatic contexts.
その陰謀は内部の者によって暴露された。
The secret plot was exposed by an insider.
彼は陰謀に関わっていると疑われている。
He is suspected of being involved in a conspiracy.
A scheme or plot, often with a negative nuance. Can be used for personal or small-scale secret plans.
A plan kept secret to surprise someone, like a party or gift.
Natural way to say 'surprise plan', often for parties or events.
彼女の誕生日にサプライズの計画を立てている。
We're making a secret plan for her birthday surprise.
A secret undertaking, often for a fun surprise. Slightly more formal than 内緒の計画.
子供たちは母の日のために内緒の企てをしている。
The kids are hatching a secret plan for Mother's Day.
秘密計画 is a neutral 'secret plan', while 陰謀 implies a malicious conspiracy. Use 陰謀 only when the plan is harmful or illegal.
彼は秘密計画で会社を成長させた。
He grew the company with a secret plan.
彼は陰謀で会社を乗っ取った。
He took over the company through a conspiracy.
Directly translating 'secret plan' as 秘密の計画 is grammatically correct but often sounds redundant or unnatural. Use 秘密計画 as a compound word, or choose a more specific term like 秘策 or 陰謀 depending on context.
He hatched a secret plan to bring down his political rival.
彼の企みは失敗に終わった。
His secret plan ended in failure.