I'm sure he only said it out of / from spite.

我肯定他说这话完全是出于恶意.

辞典例句

I'm sure he wrote that article purely out of ( or : from ) spite .

我断定他写那篇文章完全是出于 泄愤.

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I wanna see your face and say forget it just from spite.

我想看看你,告诉你,忘掉那些不愉快.

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