long-planned
premeditated
long-contemplated
Growth is a plot plan, wrong is wrong.
This was no sudden response to provocation, but a long-planned move.

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Open the tool →蓄谋已久 (xù móu yí jiǔ) means “long-planned, premeditated, long-contemplated”.
蓄谋已久 is pronounced xù móu yí jiǔ in Mandarin Chinese.
“long-planned” is 蓄谋已久 (xù móu yí jiǔ) in Chinese.
This page has 2 example sentences using 蓄谋已久, each with pinyin and an English translation.