Ununderstandable

[Sarah]

un·un·[der]·stand·a·[ble] {uhn-uhn-der-stan-duh-buhl}
–adjective
incapable of being understood, failing to be understood correctly.
{derived from that of [Michael Scott]; see misunderstood}

[Gregory]

Preposterously insane.
It can mean something that is insane beyond someones [wildest] imagination, to the point that it becomes contrary to reason or common sense.

Something that is really hard to understand, which has to be repeated twice, or [thrice] before one fully comprehends it. (It cant be over 7 times, otherwise it would be: Unununderstandable.)

Something that is [unacceptable], and intolerable (esp. by whole societies, or religions.)

[Oralee]

[Paradigm] of the [modern] [time].

[PussyCat]

its [not possible] to understand the [subject] or [sentence]