• synonyms


[som-nuh-luh nt]
See more synonyms for somnolent on Thesaurus.com
  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


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

Examples from the Web for semi-somnolent

Historical Examples

  • Some of the time, indeed, I was in a semi-somnolent state, caused by weakness.

    In New Granada

    W.H.G. Kingston

  • At the edge of the clearing a solitary Maori sentry, a man armed with a revolver, sat, keeping a semi-somnolent guard.

  • Reason regained that supreme control which the semi-somnolent state had taken away.

  • By degrees my semi-somnolent faculties reasserted themselves and I remembered where I was.

    Mr. Marx's Secret

    E. Phillips Oppenheim

  • I think this semi-somnolent attitude is not always the mere attitude of repose.

    Stanley in Africa

    James P. Boyd

British Dictionary definitions for semi-somnolent


  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 semi-somnolent



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

semi-somnolent in Medicine


  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.