adj. gloom·i·er, gloom·i·est
1. Partially or totally dark, especially dismal and dreary: a damp, gloomy day.
2. Showing or filled with gloom: gloomy faces.
a. Causing or producing gloom; depressing: gloomy news.
b. Marked by hopelessness; very pessimistic: gloomy predictions.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.