a. 不能用语言表达的, 不可言传的, 不可名状的

[ adj ]
defying expression
<adj.all>

Inexpressible \In`ex*press"i*ble\, a.
Not capable of expression or utterance in language;
ineffable; unspeakable; indescribable; unutterable; as,
inexpressible grief or pleasure. ``Inexpressible grandeur.''
--Blair.

In orbs
Of circuit inexpressible they stood. --Milton.