lacking in variety; tediously unvarying

the monotonous flat scenery.

characterizing a sound continuing on one note.

having very little inflection; limited to a narrow pitch range.

adjective

changing , ever-changing , exciting , lively , variable , versatile

adjective

banausic , blah * , boring , colorless , dreary , droning , dull , dull as dishwater , flat , flat as pancake , ho-hum , humdrum * , monotone , nothing , pedestrian , plodding , prosaic , puts one to sleep , recurrent , reiterated , repetitious , repetitive , samely , sing-song , soporific , tedious , tiresome , toneless , treadmill , unchanged , unchanging , uniform , uninflected , uninteresting , unrelieved , unvaried , unvarying , wearisome , wearying , drear , dry , humdrum , irksome , stuffy , weariful , weary , banal , drab , mundane , routine , same , stereotyped , stereotypical