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Someone who does not think there is enough evidence to prove or disprove God's existence. It's a valid viewpoint.

Some people say agnostics can't make up their mind or do their research on what to believe. I did my research on different religions and philosphical beliefs, and I made up my mind. And now I'm an agnostic. Deal with it.

Oh, and agnosticism isn't weak atheism. Atheism is believing that there is no God. You can be an agnostic athiest - one who doesn't believe in God. You can an agnostic deist - one who believes in a higher power. What you believe is different from what you know.
An agnostic is someone who does not think there is enough evidence to prove or disprove God's existence.
by The-Ventriloquist July 22, 2010
The best and most intelligent people on earth
I am an agnostic because I don't think you can prove or disprove the existance of a supreme being.
by Scott Breon November 05, 2007
Refering to a person who believes you cannot prove nor disprove an ultimate reality, specificaly in deity's

Also sometimes refered to as "weak atheists" although that is incorrect.
The term 'agnosticism' was coined by Professor T.H. Huxley at a meeting of the Metaphysical Society in 1876. He defined an agnostic as someone who disclaimed both ("strong") atheism and theism, and who believed that the question of whether a higher power existed was unsolved and insoluble. Another way of putting it is that an agnostic is someone who believes that we do not know for sure whether God exists. Some agnostics believe that we can never know.

"Weak atheism" is simple scepticism; disbelief in the existence of God.
by Jen February 01, 2004
One who does not presume to know anything outside of experience, and that for what it is.
Being agnostic makes you open to the possibility that there may or may not be a God, however, it extends to all ideas considerable.
by Andrew W. Graff September 08, 2003
One who is neither ignorant enough to believe that there is a god, nor self centered enough to believe that if there was a god, he would give a flying fuck about what they do on sundays, what they eat on fridays, and what kind of facial hair they have.
Im agnostic.
by Pseudonym 1 August 31, 2008
A person who is sensible enough to admit that they have no fucking clue what is going on in the universe.

Contrary to both a Theist (someone who sits in Church thinking they have shit figured out) and an Atheist (someone who sits at Starbucks thinking they have shit figured out).
Theist: "God exists." *prays*
Atheist: "God does not exist." *sips grande cappuccino*
Agnostic: "We can't know." *continues living*
by Cadaei June 16, 2011
n. One who believes that any higher power or deity such as God can neither be proved nor disproved, and as such, any thought on the matter is trivial and unimportant.
James is an agnostic.
by Cody England June 19, 2008