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1.
willfully disobedient; defiant; purposely ignores direction or instruction
The teenager was utterly contumacious when he used his mother's favorite glass just because she told him to leave it alone.
by Karen2 January 02, 2007
 
2.
extreme, especially related to a subculture or other nonconformist style.
"Have you seen Amber's contumacious new ducttape tutu?"
by the Masked Avenger November 26, 2003