Word Study
ennui
CIDE DICTIONARY
ennui, n. [F., fr. L. in odio in hatred. See Annoy.].
A feeling of weariness and disgust; dullness and languor of spirits, arising from satiety or want of interest; tedium. T. Gray. [1913 Webster]
OXFORD DICTIONARY
ennui, n. mental weariness from lack of occupation or interest; boredom.
Etymology
F f. L in odio: cf. ODIUM
THESAURUS
ennui
acedia, angst, anguish, anxiety, apathy, blues, boredness, boredom, cheerlessness, dejection, depression, discomfort, discomposure, discontent, dislike, dispiritedness, displeasure, disquiet, dissatisfaction, doldrums, dread, drowsiness, dullness, dumps, emptiness, enervation, existential woe, fatigue, fed-upness, flatness, grimness, heaviness, hebetude, inanimation, indifference, inquietude, jadedness, joylessness, lack of pleasure, lackadaisicalness, languidness, languishment, languor, languorousness, lassitude, lenitude, lentor, lethargy, life-weariness, lifelessness, listlessness, malaise, melancholy, nausea, nongratification, nonsatisfaction, oscitancy, painfulness, pall, passivity, phlegm, sadness, satedness, satiation, satiety, savorlessness, sleepiness, sloth, slothfulness, slowness, sluggishness, somnolence, spiritlessness, spleen, staleness, stupefaction, stupor, supineness, surfeit, taedium vitae, tastelessness, tediousness, tedium, tire, tiredness, torpidity, torpidness, torpitude, torpor, uncomfortableness, unease, uneasiness, unhappiness, unpleasure, unsatisfaction, vexation of spirit, wearifulness, weariness, weary, world-weariness, yawnROGET THESAURUS
ennui
Weariness
N weariness, defatigation, lassitude, drowsiness, disgust, nausea, loathing, sickness, satiety, taedium vitae, boredom, ennui, wearisomeness, tediousness, dull work, tedium, monotony, twice-told tale, bore, buttonholer, proser, wet blanket, pill, stiff, heavy hours, the enemy (time), wearying, wearing, wearisome, tiresome, irksome, uninteresting, stupid, bald, devoid of interest, dry, monotonous, dull, arid, tedious, humdrum, mortal, flat, prosy, prosing, slow, soporific, somniferous, disgusting, unenjoyed, weary, tired, drowsy, uninterested, flagging, used up, worn out, blase, life-weary, weary of life, sick of, wearily, usque ad nauseam, time hanging heavily on one's hands, toujours perdrix, crambe repetita.For further exploring for "ennui" in Webster Dictionary Online