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Adjective: atheistical  ,ey-thee'is-ti-kul
  1. Related to or characterized by or given to atheism
    "atheistical leanings";
    - atheist, atheistic
     
  2. Rejecting any belief in gods
    "Her atheistical views were not well-received in the conservative community";
    - atheistic, unbelieving

See also: irreligious