"humdrum" in the noun sense
1. 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"
"humdrum" in the adjective sense
1. commonplace, humdrum, prosaic, unglamorous, unglamourous
not challenging dull and lacking excitement
"an unglamorous job greasing engines"
2. humdrum, monotonous
tediously repetitious or lacking in variety all work and no play"
"a humdrum existence
"nothing is so monotonous as the sea"
Source: WordNet® (An amazing lexical database of English)
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