n. [ AS. biternys; biter better + -nys = -ness. ] 1. The quality or state of being bitter, sharp, or acrid, in either a literal or figurative sense; implacableness; resentfulness; severity; keenness of reproach or sarcasm; deep distress, grief, or vexation of mind. [ 1913 Webster ]

The lip that curls with bitterness. Percival. [ 1913 Webster ]

I will complain in the bitterness of my soul. Job vii. 11. [ 1913 Webster ]

2. A state of extreme impiety or enmity to God. [ 1913 Webster ]

Thou art in the gall of bitterness, and in the bond of iniquity. Acts viii. 23. [ 1913 Webster ]

3. Dangerous error, or schism, tending to draw persons to apostasy. [ 1913 Webster ]

Looking diligently, . . . lest any root of bitterness springing up trouble you. Heb. xii. 15. [ 1913 Webster ]