humdrum

nouns

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, monotony, sameness

adjectives

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