unutterably
adv. 非言语所能表达地；坏透地
例句
I suddenly felt unutterably depressed.
我忽然感到无法言说的压抑。
《柯林斯英汉双解大词典》
Huck sank back, panting gently, but deeply, unutterably grateful.
哈克往后退了几步，他轻轻地喘着气，但心里充满了说不出的感激。
It's unutterably too much for flesh and blood to bear — even mine.
这对于有血有肉的人是太难堪啦——连我都受不了啦！
