忍俊不禁 rěn jùn bù jīn 🔊 cannot help laughing + Review this word Meanings rěn jùn bù jīn cannot help laughingunable to restrain a smile Its characters 忍rěnto bearHSK 5俊jùnsmartHSK 7–9不bùnot; noHSK 1禁jìnto prohibit