D defs.my
Entry 3 senses Webster, 1913

Bitterness

/bĭt'-ẽrn-əs/ · Bit·ter·ness · IPA /ˈbɪtənəs/
01 n. The quality or state of being bitter, sharp, or acrid, in either a literal or figurative sense; implacableness; resentfulness; severity; ke…
  1. 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.
    “The lip that curls with bitterness.” — Percival.
    “I will complain in the bitterness of my soul.” — Job vii. 11.
  2. 2.
    A state of extreme impiety or enmity to God.
    “Thou art in the gall of bitterness, and in the bond of iniquity.” — Acts viii. 23.
  3. 3.
    Dangerous error, or schism, tending to draw persons to apostasy.
    “Looking diligently, . . . lest any root of bitterness springing up trouble you.” — Heb. xii. 15.