expression, noun-modifying (irregular)
indescribable; unutterable; inexpressible
Archaic literary expression used prenominally or adverbially to describe something so extreme (beautiful, awful, etc.) that words fail. Often found in classical poetry and prose.
えも言はず美しい景色であった。
It was an indescribably beautiful scene.
その悲しみはえも言はぬほど深かった。
The sorrow was so deep it was unutterable.