a. Monotonous; dull; commonplace. “A humdrum crone.” Bryant. [ 1913 Webster ]
n. 1. A dull fellow; a bore. B. Jonson. [ 1913 Webster ]
2. Monotonous and tedious routine. [ 1913 Webster ]
Dissatisfied with humdrum. The Nation. [ 1913 Webster ]
3. A low cart with three wheels, drawn by one horse.