misdemean

[mis-di-meen]

Origin of misdemean

late Middle English word dating back to 1350–1400; see origin at mis-1, demean2
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British Dictionary definitions for misdemeaning

misdemean

verb
  1. a rare word for misbehave
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012