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1. Not challenging; dull and lacking excitement
   - commonplace, prosaic, unglamorous, unglamourous [Brit, non-standard], mundane
    
2. Tediously repetitious or lacking in variety
   "a humdrum existence; all work and no play";
   - monotonous

1. The quality of wearisome constancy, routine, and lack of variety
   "he was sick of the humdrum of his fellow prisoners";
   - monotony, sameness

Derived forms: humdrums

See also: dull, hebetudinous [rare], unexciting

Type of: unvariedness

Encyclopedia: Humdrum