expression, noun-modifying (irregular)
beyond expression; unspeakable; inexpressible
Fixed expression used prenominally to describe something so profound, beautiful, or terrible that words fail. Often carries a literary or emotional weight.
言うに言われぬ感動に包まれた。
I was filled with an indescribable emotion.
彼女の目には言うに言われぬ悲しみが浮かんでいた。
An unspeakable sadness showed in her eyes.