Webster's English Dictionary

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monotonous

mo.not.o.nous \m*-'na:t-*n-*s, -'na:t-n*s\ aj [Gk monotonos, fr. mon- + 
   tonos tone] 1: uttered or sounded in one unvarying tone  2: tediously 
   uniform or unvarying  - mo.not.o.nous.ly av