If he disappears suddenly and unintelligibly.

如果他突然莫名其妙的消失了。

Missing is a power that can draws one's tears unintelligibly.

思念就一种可以让人莫名其妙地掉下眼泪的力量。

My query seemed to have bothered him, because he immediately began shaking his fists over his head and shouting at me unintelligibly in his native tongue.

我的询问好像使他非常生气，因为他马上握紧拳头在头上晃了晃，还用土语对我含糊不清地说了一句什么。