MONOTONOUS

adj. boring, tedious, dull, tiresome, humdrum, sleep-inducing, soporific, wearisome, wearying, tiring, monotonic, repetitious, prosaic, banal, dry, dry-as-dust, uninteresting, dreary, colourless, unexciting, run-of-the-mill, ordinary, commonplace, routine, uneventful, everyday, mechanical, banausic, Colloq ho-hum Working in an assembly line became monotonous, so I took a job in advertising