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1.
Meaning less than superior.
QuickBooks 2003 is subperior to the current version of QuickBooks. (May 13, 2008)
by MatthewMGB May 13, 2008
 
2.
Someone who gets along in life by thinking that they're better than everyone else.
Phil: Look at George, he thinks he's so cool.
Clyde: I know, he's such a subperior.
by MpegEVIL May 14, 2011