Webster's Revised Unabridged Dictionary · 1913

Humdrum

Humdrum , adjective

Monotonous; dull; commonplace.
A humdrum crone. — Bryant

Humdrum , 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.