This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of or relating to atheism.

Marked by or manifesting atheism; atheistic.

adj. related to or characterized by or given to atheism

adj. rejecting any belief in gods

"IV. i.195 (314,1) [I will think you the most pathetical break-promise] [W: atheistical] I do not see but that _pathetical_ may stand, which seems to afford as much sense and as much humour as _atheistical_."

irreligious    atheistical   

theistic    atheistical   

impious    godless   

Hellenistic    Mechanistic    altruistic    anachronistic    antagonistic    antiballistic    artistic    autistic    ballistic    capitalistic   

theistic    spiritualistic    materialistic    Marxist    individualistic    pantheistic    rationalistic    mechanistic    heretical    Aristotelian