Atheistic

A·the·is·tic

Atheistic

a.
  1. Pertaining to, implying, or containing, atheism; -- applied to things; as, atheistic doctrines, opinions, or books.
    Atheistical explications of natural effects.
  2. Disbelieving the existence of a God; impious; godless; -- applied to persons; as, an atheistic writer.