i-adjective
indescribable; inexpressible; unspeakable
Used for emotions, beauty, or experiences that are beyond words. Often appears in literary or emotional contexts. The related form 言い知れぬ is also common.
See also: 言い知れぬ
その景色は言い知れない美しさだった。
The scenery had an indescribable beauty.
彼の言葉に言い知れない不安を感じた。
I felt an inexpressible unease at his words.