Noun

• S: (n) monotony, humdrum, sameness (the quality of wearisome constancy, routine, and lack of variety) "he had never grown accustomed to the monotony of his work"; "he was sick of the humdrum of his fellow prisoners"; "he hated the sameness of the food the college served"

Adjective

• S: (adj) commonplace, humdrum, prosaic, unglamorous, unglamourous (not challenging; dull and lacking excitement) "an unglamorous job greasing engines"
• S: (adj) humdrum, monotonous (tediously repetitious or lacking in variety) "a humdrum existence; all work and no play"; "nothing is so monotonous as the sea"