Lack of variety or interest; tedious repetition or routine; the quality of being dull, unvarying, lifeless, etc.

Unvaried or wearisome sameness; monotony, esp. of life.

Dullness, commonplaceness, monotony; dull monotonous talk; with a and plural, A humdrum saying, conversation, debate, etc.

Absence of variety, uniformity, monotony; an instance of this.

The state or quality of being monotonous.

Want of incident or interest; monotony.

the quality or state of being humdrum; humdrum action.

Want of variety, monotony.