- sleepy; drowsy.
- tending to cause sleep.
Origin of somnolent
1425–75; late Middle English sompnolent < Old French < Latin somnolentus, derivative of somnus sleep; see -ulent
SynonymsSee more synonyms on Thesaurus.com
1. slumberous. 2. somniferous, soporific.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- drowsy; sleepy
- causing drowsiness
C15: from Latin somnus sleep
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for hypersomnolent
mid-15c., sompnolent, from Old French sompnolent (Modern French somnolent) or directly from Latin somnolentus "sleepy, drowsy," from somnus "sleep" (see Somnus). Respelled 17c. on Latin model.
Online Etymology Dictionary, © 2010 Douglas Harper
- Drowsy; sleepy.
- Inducing or tending to induce sleep; soporific.
- In a condition of incomplete sleep; semicomatose.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.