adj. 1. Sounded or spoken in an unvarying tone: a monotonous droning voice. 2. Tediously repetitious or lacking in variety. See Synonyms at boring. mo·noto·nous·ly adv. mo·noto·nous·ness n. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.