'Belial' definitions:

Definition of 'Belial'

From: GCIDE

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]

Belial worthlessness, frequently used in the Old Testament as a proper name. It is first used in Deut. 13:13. In the New Testament it is found only in 2 Cor. 6:15, where it is used as a name of Satan, the personification of all that is evil. It is translated "wicked" in Deut. 15:9; Ps. 41:8 (R.V. marg.); 101:3; Prov. 6:12, etc. The expression "son" or "man of Belial" means simply a worthless, lawless person (Judg. 19:22; 20:13; 1 Sam. 1:16; 2:12).