inapprehensible

Not merely, therefore, is the phenomenon inexplicable to you, but the very nature of it is inapprehensible by you.

Unapprehen′sible, inapprehensible; Unapprehen′sive, not apprehensive or fearful: not intelligent.

Inapprehensible, in-ap-pre-hen′si-bl, adj. not apprehensible or intelligible.