unreal (adj.)youdaoicibaDictYouDict[unreal 词源字典]
c. 1600, "not real," from un- (1) "not" + real (adj.). Meaning "impractical, visionary" is by 1660s. Slang sense of "wonderful, great" is first recorded 1965.
Unreal City,
Under the brown fog of a winter dawn,
A crowd flowed over London Bridge, so many,
I had not thought death had undone so many.

[Eliot, "The Waste Land," 1922]
[unreal etymology, unreal origin, 英语词源]