Example : 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.

Synonyms : monotony, sameness

Example : An unglamorous job greasing engines.

Synonyms : commonplace, prosaic, unglamorous, unglamourous

Example : A humdrum existence; all work and no play.
Nothing is so monotonous as the sea.

Synonyms : monotonous