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somnolent

[som-nuh-luh nt]
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adjective
  1. sleepy; drowsy.
  2. tending to cause sleep.
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Origin of somnolent

1425–75; late Middle English sompnolent < Old French < Latin somnolentus, derivative of somnus sleep; see -ulent
Related formssom·no·lence, som·no·len·cy, nounsom·no·lent·ly, adverbhy·per·som·no·lence, nounhy·per·som·no·lent, adjectivehy·per·som·no·lent·ly, adverbsem·i·som·no·lence, nounsem·i·som·no·lent, adjectivesem·i·som·no·lent·ly, adverbun·som·no·lent, adjectiveun·som·no·lent·ly, adverb

Synonyms

See more synonyms for somnolent on Thesaurus.com
1. slumberous. 2. somniferous, soporific.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for hypersomnolent

somnolent

adjective
  1. drowsy; sleepy
  2. causing drowsiness
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Derived Formssomnolence or somnolency, nounsomnolently, adverb

Word Origin

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

somnolent

adj.

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

hypersomnolent in Medicine

somnolent

(sŏmnə-lənt)
adj.
  1. Drowsy; sleepy.
  2. Inducing or tending to induce sleep; soporific.
  3. In a condition of incomplete sleep; semicomatose.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.