愚鲁 (yúlǔ): dull-witted

Meanings

Tā zìchēng yúlǔ, qíshí hěn cōngmíng.

He calls himself dull, but he's actually quite clever.

Wǒ tiānzī yúlǔ, qǐng duō zhǐjiào.

I'm slow by nature; please instruct me.

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Literary and self-deprecating. People use 愚鲁 about themselves to sound humble; calling someone else 愚鲁 is harsh.

愚 yú

鲁 Lǔ