Entry 4 senses · 2 variants Webster, 1913 Humdrum /hŭm'-drŭmˌ/ · Hum·drum · IPA /ˈhʌmdɹʌm/ a. n. 01 a. Monotonous; dull; commonplace. 1. Monotonous; dull; commonplace. 02 n. A dull fellow; a bore. 1. A dull fellow; a bore. 2. Monotonous and tedious routine. “Dissatisfied with humdrum.” — The Nation. 3. A low cart with three wheels, drawn by one horse.