Of or relating to atheists or atheism; atheistic.
To make someone an atheist.
A person who does not believe in a particular deity (or any deity in a particular pantheon), notwithstanding that they may believe in another deity.
A person who does not believe in any religion (not even a religion without gods)
A person who has no belief in any deities, such as a person who has no concept of deities.
A person who does not believe in deities.
A person who believes that no deities exist (especially, one who has no other religious belief).
A person who rejects belief that any deities exist (whether or not that person believes that deities do not exist).
Atheist.
An atheist.