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Synonyms

somnolent

American  
[som-nuh-luhnt] / ˈsɒm nə lənt /

adjective

  1. sleepy; drowsy.

    Synonyms:
    slumberous
  2. tending to cause sleep.

    Synonyms:
    soporific, somniferous

somnolent British  
/ ˈsɒmnələnt /

adjective

  1. drowsy; sleepy

  2. causing drowsiness

"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

Other Word Forms

Etymology

Origin of somnolent

1425–75; late Middle English sompnolent < Old French < Latin somnolentus, derivative of somnus sleep; see -ulent

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Explanation

If you're somnolent, you're feeling sleepy or drowsy. It's best to avoid operating speedboats or motorcycles when you're somnolent. Somnolent comes from the Latin word somnolentia, meaning "sleepiness," which in turn is from the Latin root somnus, for "sleep." You can feel somnolent, or describe something as being somnolent. Something described as somnolent is likely to induce sleep, like a boring movie in an overheated theater, or the low, somnolent lighting in a museum exhibit of fragile, old manuscripts.

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Vocabulary lists containing somnolent

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Exoprojection in which the somnolent user is able to assume a conscious awareness of an ideal reality from the past.

From The Wall Street Journal • Mar. 23, 2026

Ham turned a disjointed team into something tough and competitive and changed the entire somnolent Lakers culture.

From Los Angeles Times • Jan. 8, 2024

Overall, the recording slides between hypnotic and somnolent.

From New York Times • Mar. 30, 2023

Set against the backdrop of a somnolent downtown, says Ms. Respress, the McPherson Square encampment feeds the impression that homelessness is exploding in D.C.

From Washington Post • Feb. 10, 2023

There are three Smart Aids in Englewood, the small, somnolent beach town where I live.

From "Miss Peregrine's Home for Peculiar Children" by Ransom Riggs

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