adjective
- Experiencing or accompanied by sleeplessness."insomniac old people"; "insomniac nights"; "lay sleepless all night"; "twenty watchful, weary, tedious nights- Shakespeare
- Always watchful."to an eye like mine, a lidless watcher of the public weal- Alfred Tennyson
- synonyms: lidless
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). sleepless. Retrieved September 20, 2026, from http://smartdefine.org/sleepless/definitions/1183714 |
| Chicago | WordNet. 2010. "sleepless" http://smartdefine.org/sleepless/definitions/1183714 (accessed September 20, 2026). |
| Harvard | WordNet 2010, sleepless, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/sleepless/definitions/1183714>. |
| MLA | WordNet. "sleepless" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/sleepless/definitions/1183714> |