Someone who doesn't believe in any god is godless. Your religious grandmother might refer to your atheist uncle as godless.

While the adjective godless literally means just "not revering a god," it's most often used by religious people or groups to criticize those who don't show the proper respect to God or religion, or those who are unbelievers. When a group is described as a "godless society," it's usually an observation of a perceived lack of morality or law, coming from the idea that people who believe in God are better, more moral citizens.

Definitions of godless

adj not revering god

lacking piety or reverence for a god

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