Source : Webster's Revised Unabridged Dictionary (1913)

Scoundrel \Scoun"drel\, n. [Probably from Prov. E. & Scotch
   scunner, scouner, to loathe, to disgust, akin to AS. scunian
   to shun. See {Shun}.]
   A mean, worthless fellow; a rascal; a villain; a man without
   honor or virtue.

         Go, if your ancient, but ignoble blood Has crept
         through scoundrels ever since the flood. --Pope.

Scoundrel \Scoun"drel\, a.
   Low; base; mean; unprincipled.

Source : WordNet®

scoundrel
     n : a wicked or evil person; someone who does evil deliberately
         [syn: {villain}]