Answer: monotonous

AnswerCrossword Clue
MONOTONOUSHo-hum
MONOTONOUSLike a one-note performance
MONOTONOUSLike a stereotypically bad professor
MONOTONOUSTediously repetitious
monotonous(of a sound or utterance) Lacking in variation in tone or pitch
monotonousuttered or sounded in one unvarying tone
monotonousDull, tedious, and repetitious; lacking in variety and interest