adj. lone·li·er, lone·li·est
a. Dejected by the awareness of being alone. See Synonyms at alone.
b. Producing such dejection: the loneliest night of the week.
2. Without others of a similar kind; lone; solitary: "a lonely band of lawyers up against the might of the American legal establishment" (Nick Kotz).
3. Unfrequented by people; desolate: a lonely crossroads.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.