monotony
/məˈnɒtənɪ/noun
mass noun
1- lack of variety and interest; tedious repetition and routine单一; 单调; 千篇一律：
you can become resigned to the monotony of captivity.
你会对监禁生活的单调习以为常的。
1.1
- sameness of pitch or tone in a sound or utterance（声音或话语的）单调：
depression flattens the voice almost to monotony.
抑郁使说话声变得几乎完全平直。