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思わず， おもわず
1. unconsciously, involuntarily, instinctively, reflexively, spontaneously, unintentionally, in spite of oneself
不自觉地，不由自主地，本能地，反射性地，自发地，无意间，尽管自己不愿
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笑う， 嗤う， 咲う， わらう
1. to laugh
2. to smile
3. to sneer, to ridicule
4. to be dumbfounded, to be flabbergasted
笑；微笑；冷笑，嘲弄；冷笑，嘲弄