ungrammatical

The essay is ungrammatical and incoherent.

文章写得文理不通.

《现代汉英综合大词典》

Too many ungrammatical expressions are used.

使用许多不合语法的表达法.

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Some films have strange names and ungrammatical structures.

一些电影名字奇怪,语法结构混乱.

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