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Definition of irritation:

1. A condition of morbid excitability or oversensitiveness of an organ or part of the body; a state in which the application of ordinary stimuli produces pain or excessive or vitiated action.
2. The act of exciting, or the condition of being excited to action, by stimulation; -- as, the condition of an organ of sense, when its nerve is affected by some external body; esp., the act of exciting muscle fibers to contraction, by artificial stimulation; as, the irritation of a motor nerve by electricity; also, the condition of a muscle and nerve, under such stimulation.
3. The act of irritating, or exciting, or the state of being irritated; excitement; stimulation, usually of an undue and uncomfortable kind; especially, excitement of anger or passion; provocation; annoyance; anger.

Synonyms:

passion, incitement, aggravator, anger, fervour, biliousness, nuisance, menace, neuralgia, mood, incitation, chafe, drag, animosity, pestering, temper, irritant, soreness, surliness, besetment, stress, pip, rage, discomfort, pettishness, toughness, pest, feelings, snappishness, impatience, fervor, provocation, choler, botheration, upset, innervation, excitement, rawness, annoying, worry, peeve, humour, vexation, aggro, outrage, fretfulness, asperity, bothering, irritability, pain in the neck, excitation, aggravation, calamity, annoyance, plague, fury, pique, humor, help, joke, eina, pain in the ass, peevishness, concern, tenderness.

• discontentment (part of speech: noun)
  • despondence, 
  • wretchedness, 
  • angst, 
  • boredom, 
  • uncomfortableness, 
  • disquiet, 
  • exasperation, 
  • discomposure, 
  • misery, 
  • disgruntlement, 
  • non-satisfaction, 
  • cheerlessness, 
  • dissatisfaction, 
  • discomfort, 
  • anguish, 
  • frustration, 
  • ennui, 
  • inquietude, 
  • joylessness, 
  • sourness, 
  • gloominess, 
  • discontent, 
  • uneasiness, 
  • anxiety, 
  • displeasure, 
  • unhappiness
• pain (part of speech: noun)
  • grief, 
  • spasm, 
  • headache, 
  • burn, 
  • hurt, 
  • stitch, 
  • painfulness, 
  • suffering, 
  • wound, 
  • stab, 
  • malaise, 
  • earache, 
  • smarting, 
  • cramp, 
  • bite, 
  • crick, 
  • sting, 
  • migraine, 
  • pain, 
  • pang, 
  • rack, 
  • torment, 
  • back-ache, 
  • infliction, 
  • gripe, 
  • distress, 
  • sore, 
  • agony, 
  • ache, 
  • affliction, 
  • injury, 
  • anguish, 
  • wrench, 
  • throe, 
  • torture, 
  • misery, 
  • discomfort, 
  • inflammation, 
  • bruise, 
  • throb, 
  • chafing
• aggravation (part of speech: noun)
  • exacerbation, 
  • provocation, 
  • perturbation, 
  • harassment, 
  • aggravation, 
  • petulance, 
  • inflammation, 
  • exasperation, 
  • discomposure, 
  • bother, 
  • trouble, 
  • scorn, 
  • pique, 
  • virulence, 
  • arousal, 
  • disturbance, 
  • indignation, 
  • enragement, 
  • resentment, 
  • vexation, 
  • torment, 
  • bedevilment, 
  • annoyance, 
  • ire
• painfulness (part of speech: noun)
  • cruelty, 
  • offensiveness, 
  • torture, 
  • severity, 
  • unpleasantness, 
  • bitterness, 
  • anguish, 
  • misery, 
  • torment, 
  • ache, 
  • uncomfortableness, 
  • grievousness, 
  • odiousness, 
  • distressfulness, 
  • aggravation, 
  • oppressiveness, 
  • annoyingness, 
  • soreness, 
  • irksomeness, 
  • arduousness, 
  • hurtfulness, 
  • woefulness, 
  • agony, 
  • acuteness, 
  • painfulness
• sensitivity (part of speech: noun)
  • susceptibility, 
  • sensitivity, 
  • susceptibleness
• resentment (part of speech: noun)
  • hard feelings, 
  • acerbity, 
  • ill humor, 
  • soreness, 
  • resentment, 
  • rancor, 
  • bitterness, 
  • pique, 
  • spite, 
  • bile, 
  • antagonism, 
  • huffiness, 
  • umbrage, 
  • envy, 
  • vexation, 
  • infuriation, 
  • sullenness, 
  • wrath, 
  • discontent, 
  • dissatisfaction, 
  • indignation, 
  • offense