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A person who has given up faith in religions or any high science, and relys on their 5 senses, basic instincts and material science to determine what they believe.
Side affects: -may not see a difference between humans and animals.
-May believe in survival of the fittest or other rules of nature.
-may not find a purpose in life, or believe in an afterlife.
Atheist: "Wait a second, its scientificly impossible to have a man in the clouds, therefore, God doesn't exist at all."
atheist by Jerry J. October 11, 2005
1. A Theist, a person with belief in a God, from the Greek theos, belief. Often has dreams of grandeur due to belief that they're right.
2. Atheist, a person without belief in a God, from the Greek A, without, and theos, belief. Often has dreams of grandeur due to the belief that they're right.
1. Yayhew exists
2. Oh no he doesn't
1. Oh yes he does
Atheist by Ytaker January 3, 2005
An idiot, who cannot accept anything truthful, and sees themselves higher than a deity. They also often refuse to believe in a deity only because they get bored during religious services. They don't understand that they don't have to go, but they can still believe! Damn teenagers.
I'm pretty sure Rosie O'Donnell is an atheist, however she could be Scientologist, or even Dr. Philliate.
Atheist by Mr. Holbrook, aka GOD February 19, 2009
Something that a lot of people claim to be. However they don't seem to exist on a battlefield or in a hospital emergency room.
Dave was always claimed to be an atheist and how he did not believe in God until he nearly died in a violent mugging. When he was praying to God to spare his life.
atheist by ericlebo May 9, 2011
A strong minded person who has dedicated himself to a disbelief in god based on roughly the same amount of evidence a religious follower uses to dedicate himself to a belief in god. These type of people typically profess themselves as logically superior, yet its not uncommon for them to base their disbelief in god on a simple dislike for organized religions. They are as unable to accept uncertainty as your average believer.
Atheist by Anonymous September 30, 2003
Someone who does not believe in a god, and always mentioning how Christians and other religious people have murdered many people throughout history (even though atheists have killed millions upon millions of more humans in just the 20th Century alone).
Sarah: Hey Greg, I'm an atheist; do you know how many people were killed in the name of God?

Greg: Well, those people weren't really Christians, because real Christians don't murder. However, do you know how many more millions of people were killed under atheistic rule?

Sarah: Errrrrrrr, um, dunno.

Greg: Interesting...
atheist by ChaddyMan April 11, 2011