Flat, Harping, Heavy, Hollow, Humdrum, Inane, Indifferent, Insipid, Invariable, Jejune, Laborious, Leaden, Lifeless, Mechanical, Mediocre, Medium, Middling, Moderate, Modest, Monotone, Monotonous, Mortal, Pale, Pallid, Passable, Pedestrian, Plodding, Pointless, Poky, Ponderous, Prolix, Prolonged, Prosaic, Repetitious, Repetitive, Respectable, Rhymed, Rhyming, Routine, Same, Singsong, Slow, Solemn, Soporific, Spiritless, Sterile, Stiff, Stodgy, Stuffy, Superficial, Tasteless, Tiresome, Tiring, Tolerable, Treadmill, Unchanging, Unending, Uneventful, Unexciting, Uninteresting, Unrelieved, Unvarying, Vapid, Wearing, Wearisome, Wearying, Wooden, Alliterating, Alliterative, Arid, Automatic, Banal, Barren, Blah, Blank, Bloodless, Boring, Changeless, Chanting, Characterless, Chiming, Cold, Dead, Dingdong, Dismal, Drab, Dragging, Dreary, Dry, Dull, Dusty, Effete, Elephantine, Empty, Endless, Everlasting, Exhausting, Fade, Fair, Fairish, Fatiguing