An atheist believes there is no such thing as god, or any other deity.

The root -theist means "belief in a god." The prefixes mono-, poly-, and a-, mean "one," "many," and "no," respectively. So a monotheist is someone who believes in a single god, a polytheist is someone who believes in many gods, and an atheist is someone who believes there is no god at all.

Definitions of atheist

n someone who denies the existence of god

Type of:
disbeliever, nonbeliever, unbeliever
someone who refuses to believe (as in a divinity)

adj related to or characterized by or given to atheism

atheist leanings”
atheistic, atheistical

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