The Collaborative International Dictionary of English v.0.48:

Belial \Be"li*al\, n. [Heb. beli ya'al; beli without + ya'al
   profit.]
   An evil spirit; a wicked and unprincipled person; the
   personification of evil.
   [1913 Webster]

         What concord hath Christ with Belia ?    --2 Cor. vi.
                                                  15.
   [1913 Webster]

   A son (or man) of Belial, a worthless, wicked, or
      thoroughly depraved person. --1 Sam. ii. 12.
      [1913 Webster]