a. Being or having no beneficial use; ineffective: This pen is useless because it's out of ink. See Synonyms at futile.
b. Having no purpose or reason; pointless; to no avail: It's useless to argue over matters of taste.
2. Incapable of acting or functioning effectively; ineffectual or inept: He panics easily and is useless in an emergency.
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.