An agnostic is someone who believes that we cannot know for sure whether God or any ultimate reality exists. It can also describe a person who is undecided or noncommittal about a particular issue.
Coined in the 1860s by English biologist T. H. Huxley from Greek *a-* “not” + *gnōstos* “known,” literally meaning “one who does not know.” It was a reaction against people who claimed certainty about things that can’t be proven.
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