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Definition of monotonous : Uttered in one unvarying tone; continued with dull uniformity; characterized by monotony; without change or variety; wearisome.

Synonyms:

ponderous, collegiate, colorless, dead, jading, monotone, drab, prostrate, savorless, two-dimensional, antisocial, drear, unmusical, monochromatic, assistant, old, matted, disembodied, clerical, croaky, unglamorous, jejune, unmelodious, mind-numbing, matte, excite, tiring, multiple, stodgy, numbing, bland, casual, leaden, unchanged, single, categorical, unconditional, dusty, savourless, flavourless, stupid, irksome, grating, fruity, flavorless, appealing, pedestrian, matt, tame, associate, drudging, wearying, ho-hum, heavy, plane, unglamourous, arid, vapid, adenoidal, unmelodic, collaborative, compressed, stuffy, stale, categoric, monotonic, ceremonial, adjunct, weary, cooperative, mat, weariful, brittle, various, varying, slow, breathy

dull, uninteresting, boring, humdrum, insipid, dreary, wearisome, dry, tiresome, prosaic, tedious, depressing

everyday, mundane, habitual, periodic, cyclical, commonplace, ordinary, continual, constant, standard, familiar, epochal, chronic, predominating, steady, stock, frequent, orthodox, accustomed, general, average, recurrent, prevailing, regular, rhythmic, metronomic, routine, conventional, universal, traditional, common, customary, normal, usual, canonical

invariable, seamless, unchangeable, repeated, consecutive, unceasing, persistent, everlasting, coherent, flat, sequential, undeviating, unvarying, continuing, nonstop, undying, homogeneous, incessant, un-intermittent, gapless, straight, featureless, level, perennial, unending, interminable, perpetual, indefatigable, endless, connected, unremitting, unbroken, uniform, lasting, ceaseless, consistent, robot-like, continuous, even, monolithic, unchanging, repetitive

Usage examples:

• From this ground, the view to the south as a medium point, was over as dark and monotonous a country as could well be described. - "Expedition into Central Australia", Charles Sturt.
• She walked backward and forward in that monotonous wandering for some time before she was able to steady her thoughts- before she was able to bring the scattered forces of her narrow intellect to bear upon the one all- important subject of the threat contained in the barrister's letter. - "Lady Audley's Secret", Mary Elizabeth Braddon.
• His Honor was looking over some papers, and the monotonous tones of the witness diverted attention. - "The Underdog", F. Hopkinson Smith.