adj. must·i·er, must·i·est
1. Stale or moldy in odor or taste.
a. Hackneyed or trite; dull.
b. Out of date; antiquated.
c. Out of use or practice; rusty.
[Alteration of obsolete moisty, from MOIST.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.