Also found in: Thesaurus, Idioms.
1. Having or bearing no name: nameless stars.
2. Unknown by name; obscure: the nameless dead.
3. Not designated by name; anonymous: a nameless benefactor.
4. Defying description; inexpressible: nameless horror.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.