adverb
- Without sleep; in a sleepless manner.
- usage: "he was lying in bed sleeplessly"
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). sleeplessly. Retrieved September 20, 2026, from http://smartdefine.org/sleeplessly/definitions/1253317 |
| Chicago | WordNet. 2010. "sleeplessly" http://smartdefine.org/sleeplessly/definitions/1253317 (accessed September 20, 2026). |
| Harvard | WordNet 2010, sleeplessly, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/sleeplessly/definitions/1253317>. |
| MLA | WordNet. "sleeplessly" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/sleeplessly/definitions/1253317> |