As a Noun: 1. The repetition of some activity time and time again without any variety or change. English = monotony, tedium. As a Verb or Adjective: 1. To be unchanging and always the same, especially when it is uninteresting and boring. English = (be) monotonous, (be) repetitive. 2. To do the same thing time and time again without changing in a boring way. English = (be) tedious.