Cosmothetic /(k?z`m?-th?t"?k)/

Cos·mo·thet·ic

Cosmothetic

a.
  1. Assuming or positing the actual existence or reality of the physical or external world. (Metaph.)
    The cosmothetic idealists . . . deny that mind is immediately conscious of matter.

Phrases & Compounds
Cosmothetic idealists
those who assume, without attempting to prove, the reality of external objects as corresponding to, and being the ground of, the ideas of which only the mind has direct cognizance.