刀子口豆腐心 的英文怎麼說?

[1] somebody is hard on the outside and soft on the inside[2] one's bark is bigger than one's bite

hard on the outside and soft on the inside = 外在冷淡但內心熱情，此為最貼切的英文說法之一。

one's bark is bigger than one's bite = 言語比行動嚇人，有時候正有刀子口豆腐心的意思

這些都是正統的美語說法.