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Definition of bitterness : 1. A state of extreme impiety or enmity to God.
2. Dangerous error, or schism, tending to draw persons to apostasy.
3. 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.

Synonyms:

saddle sore, gall, unkindness, sweetness, malignity, harshness, rancour, impertinence, icterus, pain, sour, moroseness, crust, balm, solace, feelings, spininess, blandness, asperity, thorniness, bristliness, distress, cynicism, embitterment, enjoyment, bitter, mordancy, impudence, resentfulness, rancorousness, freshness, insolence, jaundice, virulency, cheekiness

aversion, enmity, abomination, malice, rancor, hate, antipathy, disgust, repulsion, acrimony, detestation, hatred, repugnance, antagonism, loathing, wrath, animosity, abhorrence, disaffection

cruelty, torture, aggravation, hurtfulness, grievousness, severity, arduousness, agony, painfulness, ache, offensiveness, irksomeness, odiousness, acuteness, woefulness, uncomfortableness, oppressiveness, unpleasantness, misery, annoyingness, anguish, torment, distressfulness

pungency, piquancy, unripeness, sharpness

cattiness, venom, hatefulness, viciousness, wickedness, bane, corrosiveness, meanness, sinisterness, virulence, malignancy, ill nature, nastiness, evil, foulness, maliciousness

contention, polarity, averseness, discordance, coolness, malevolence, conflict, bad blood, inimicality, adverseness, incompatibility, dislike, hostility, alienation, unfriendliness, quarrelsomeness, inharmoniousness, tension, friction, combativeness, coldness, opposition, contrariety

frozenness, frigidity, gelidity, iciness, freeze, frostiness, cold, chill

ill humor, dissatisfaction, pique, offense, envy, discontent, soreness, irritation, spite, sullenness, umbrage, vexation, hard feelings, infuriation, indignation, bile, resentment

crabbedness, petulance, irritability, crossness, acerbity, peevishness, huffiness, crankiness, cantankerousness, bitchiness, surliness, sourness, pettiness, touchiness, bearishness, causticity, crustiness, churlishness, prickliness, tartness, spitefulness, bellicosity, acidity, irascibility

poignancy, acridity, spiciness

Usage examples:

• The man's whole life is not worth one hour of Melody's," he added with some bitterness; " but that makes no difference, I suppose. - "Melody The Story of a Child", Laura E. Richards.
• The bitterness was gone now and ill feeling forgotten. - "The Comings of Cousin Ann", Emma Speed Sampson.
• Why we hate with so much bitterness those who deceive us is because they think themselves more clever than we are. - "The Best of the World's Classics, Restricted to Prose, Vol. VII (of X)--Continental Europe I", Various.