atheistical
1. [ adjective ] related to or characterized by or given to atheism
Synonyms: atheistic atheist
Examples:

"atheist leanings"

Related terms: atheism atheism
2. [ adjective ] (religion) rejecting any belief in gods
Synonyms: atheistic unbelieving
Related terms: irreligious
Similar spelling:   atheistic
  attestation
  at_the_start