“不凑巧”的英语可以翻译为：inopportune ...

真不凑巧! 他出去了.What bad luck! He's not at home.不凑巧, 我把那本笔记本放在家里了.As it happens, I have left the note book at home.不凑巧,那晚偏下雨.By ill luck it was a rainy evening....