agnostic
noun ag·nos·tic \ag-ˈnäs-tik, əg-\
Simple Definition of agnostic
: a person who does not have a definite belief about whether God exists or not
: a person who does not believe or is unsure of something
Source: Merriam-Webster's Learner's Dictionary
Full Definition of agnostic
1: a person who holds the view that any ultimate reality (as God) is unknown and probably unknowable; broadly : one who is not committed to believing in either the existence or the nonexistence of God or a god
2: a person who is unwilling to commit to an opinion about something <political agnostics>
agnosticism \-tə-ˌsi-zəm\ noun
Source: Merriam-Webster
http://www.merriam-webster.com/dictionary/agnostic
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