纯属

原文表达已经非常精炼准确了，你在后面加上那句话纯属画蛇添足。

yuán wén biǎo dá yǐ jīng fēi cháng jīng liàn zhǔn què le, nǐ zài hòu miàn jiā shàng nà jù huà chún shǔ huà shé tiān zú.

The original expression is already very concise and accurate. You adding that sentence at the end is just superfluous.

任何企图分裂国家主权领土完整的罪恶图谋，纯属痴心妄想，注定会彻底破产。

rèn hé qǐ tú fēn liè guó jiā zhǔ quán lǐng tǔ wán zhěng de zuì è tú móu, chún shǔ chī xīn wàng xiǎng, zhù dìng huì chè dǐ pò chǎn.

Any criminal attempt to split the country's sovereignty and territorial integrity is purely wishful thinking and is destined to be completely bankrupt.