Synonyms and related words :
abdomen, acerbity, acid, acidity, acidulousness, acrimony, anger, angst, anguish, animosity, anus, anxiety, appendix, asperity, bad humor, bad temper, bile, biliousness, bitter resentment, bitterness, bitterness of spirit, blind gut, boredness, boredom, bowels, brain, causticity, cecum, cheerlessness, choler, colon, corrosiveness, despite, despitefulness, discomfort, discomposure, discontent, dislike, dispiritedness, displeasure, disquiet, dissatisfaction, dread, dullness, duodenum, emptiness, endocardium, ennui, entrails, existential woe, fed-upness, flatness, foregut, gall, giblets, gizzard, gnashing of teeth, grimness, grudge, guts, hard feelings, heart, heartburning, hindgut, ill, ill humor, ill nature, ill temper, innards, inner mechanism, inquietude, insides, internals, intestine, inwards, jadedness, jejunum, joylessness, kidney, kishkes, lack of pleasure, large intestine, life-weariness, liver, liver and lights, lung, malaise, melancholy, midgut, nausea, nongratification, nonsatisfaction, painfulness, perineum, pump, pylorus, rancor, rankling, rectum, satiation, satiety, savorlessness, slow burn, small intestine, soreness, sourness, staleness, stomach, taedium vitae, tastelessness, tediousness, tedium, ticker, tiredness, tripes, uncomfortableness, unease, uneasiness, unhappiness, unpleasure, unsatisfaction, vermiform appendix, vexation of spirit, virulence, viscera, vitals, wearifulness, weariness, works, world-weariness, wrath