mod. unbelievable. : Your hairdo is so yummy—almost unreal. , Who started this unreal argument?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
unreal
1605, "not real," from un- (1) "not" + real (adj.). Slang sense of "wonderful, great" is first recorded 1965.