(un-, prefix1 affix 1b.)

not to be spoken of, (to be) beyond all description. Obsolete.

Without a phrase or phrases (in various senses).

poetic. That cannot be adequately portrayed in words; indescribable. Obsolete.

= inexpressive, adj. 1. Obsolete.

Inexpressible.

figurative. Capable of ‘flight’, soaring, aspiring; soaring out of reach, eluding grasp or comprehension.

(un-, prefix1 affix 1b.)

That transcends description; too great, beautiful, etc. to be adequately described.

Impossible to picture; that cannot (easily) be envisaged or portrayed.

That cannot be portrayed (accurately); impossible to portray.

utterly indescribable.