1) All work and no play 2) Boring 3) Commonplace 4) Dreary 5) Dull 6) Dull and lacking excitement 7) Dull as dishwater 8) Exclusively Saxon word 9) Exclusively Anglo word 10) Lacking variety 11) Monotonous 12) Not challenging 13) Not too exciting 14) Ordinary or dull 15) Prosaic 16) Unexciting 17) Unglamorous 1) Banal 2) Blah 3) Drab 4) Dull 5) Mundane 6) Ordinary 7) Prosaic 8) Routine 9) Slow 10) Tiresome 11) Trite 12) Unglamorous 13) Unglamourous 14) Uninteresting 15) Unsurprising 
• (a.) Monotonous; dull; commonplace. • (n.) A low cart with three wheels, drawn by one horse. • (n.) A dull fellow; a bore. • (n.) Monotonous and tedious routine.
Hum'drum` adjective Monotonous; dull; commonplace. 'A humdrum crone.' Bryant. Hum'drum` noun 1. A dull fellow; a bore. B. Jonson. 2. Monotonous and tedious routine. « Dissatisfied with humdrum .» The Nation. 3. A low cart with three wheels, drawn by one horse. 
[adj] - tediously repetitious or lacking in variety
monotonous adjective tediously repetitious or lacking in variety; `a humdrum existence; all work and no play`; `nothing is so monotonous as the sea`
lacking variety; boring; dull: a humdrum existence.