on a treadmill (adjective) ceaseless: never-ending
Sinonime: apathy, detachment,
disgust, distaste, doldrums, dullness,
ennui,
fatigue, flatness, incuriosity, indifference, irksomeness, jadedness, lack of interest, lassitude, lethargy, listlessness,
monotony, pococurantism, sameness, taedium vitae, tediousness, tedium, tiresomeness, unconcern, world-weariness, yawn
Antonime: excitement, interest,
pleasure