resentment

n. feeling of ill-will, sense of bitterness, indignation, displeasure

Resentment is an emotion of anger felt as a result of a real or imagined wrong done. Etymologically from "ressentir", French re-, intensive prefix, and sentir "to feel"; from the latin "sentire". The English word has become synonymous with anger and bitterness. It can be an emotionally disturbing experience that is being felt again or relived in the mind. When the person feeling resentment is directing the emotion at himself it appears as remorse.(See Kierkegaard and Nietzsche; also 12-step discussion of Resentment)
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Noun
1. a feeling of deep and bitter anger and ill-will
(synonym) bitterness, gall, rancor, rancour
(hypernym) hostility, enmity, ill will
(hyponym) heartburning
(derivation) resent

(n.)
The state of holding something in the mind as a subject of contemplation, or of being inclined to reflect upon something; a state of consciousness; conviction; feeling; impression.
  

(n.)
The act of resenting.
  

(n.)
In a good sense, satisfaction; gratitude.
  

(n.)
In a bad sense, strong displeasure; anger; hostility provoked by a wrong or injury experienced.
  

Synonyms and related words:
Faustianism, acrimony, agitation, anger, animosity, animus, annoyance, antagonism, antipathy, anxiety, bitterness, cold comfort, disappointment, discontent, discontentedness, discontentment, disgruntlement, displeasure, dissatisfaction, dissatisfiedness, divine discontent, dudgeon, enmity, envy, fury, grudge, hate, hostility, huff, ill humor, ill will, indignation, ire, irritation, jealousy, malice, malignancy, malignity, miff, peevishness, petulance, pique, provocation, querulousness, rancor, rebelliousness, restiveness, restlessness, snuff, sourness, spite, sulkiness, umbrage, uneasiness, unfulfillment, unhappiness, unpleasure, unsatisfaction, upset, vexation of spirit