adj. must·i·er, must·i·est 1. Stale or moldy in odor or taste. 2. a. Hackneyed or trite; dull. b. Out of date; antiquated. c. Out of use or practice; rusty. musti·ly adv. musti·ness n. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.