Dictionary.com
Thesaurus.com
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

Compare meaning

How does somnolent compare to similar and commonly confused words? Explore the most common comparisons:

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.

Keep Reading on Vocabulary.com

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

Amid skepticism that he couldn’t coach at the higher level, Jackson tore the program down to the studs, brought in 86 new players, and blanketed the somnolent program with passion and positivity.

From Los Angeles Times • Oct. 29, 2023

Telfaz11 started out on YouTube, where its videos hooked young Saudis looking for a hip alternative to the somnolent broadcast television.

From New York Times • Dec. 27, 2021

There is a rather famous account of a World War I pilot who reported finding himself floating through a school of apparently somnolent swifts high above the clouds.

From Washington Post • Oct. 15, 2021

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