unspeakable
/ˌʌnˈspiːkəbl/adjective
1- not able to be expressed in words说不出的, 难以用言语表达的：
I felt an unspeakable tenderness towards her.
我对她怀有难以用语言表达的温情。
1.1
- too bad or horrific to express in words恶劣（或恐怖）得说不出口的。
派生词