nebulous

adjective

neb·​u·​lous ˈne-byə-ləs How to pronounce nebulous (audio)
1
: of, relating to, or resembling a nebula : nebular
2
: indistinct, vague
… this nebulous thing called jazz.Josef Woodard
… the nebulous region between mere suspicion and probable causeW. R. LaFave & J. H. Israel
The plan is too nebulous.
nebulously adverb
nebulousness noun

Did you know?

Nebulous may sound other-worldly—after all, it’s related to nebula, which refers to a distant galaxy or an interstellar cloud of gas or dust—but its mysteriousness is rooted in more earthly unknowns. Both words ultimately come from Latin nebula, meaning “mist, cloud,” and as far back as the 14th century nebulous could mean simply “cloudy” or “foggy.” Nebulous has since the late 17th century been the adjective correlating to nebula (as in “nebulous gas”), but the word is more familiar in its figurative use, where it describes things that are indistinct or vague, as when Jack London wrote of “ideas that were nebulous at best and that in reality were remembered sensations.”

Examples of nebulous in a Sentence

These philosophical concepts can be nebulous. made nebulous references to some major changes the future may hold
Recent Examples on the Web
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Referred to as Lynds 483, or LBN 483,, this nebulous outflow is located about 650 light years away. Keith Cooper, Space.com, 16 Mar. 2025 The main thrust of World Beyond is to provide context for the nebulous Civic Republic Military (CRM) — which spirited our beloved Rick early in season 9 — as well as insight about where the ex-sheriff is now. Declan Gallagher, EW.com, 14 Mar. 2025 Slower payment terms are something that happens in that nebulous space between what’s written on a contract, the commercial realities of the market and the business relationships involved. Evan Clark, WWD, 13 Mar. 2025 The parameters of free speech, however, were still nebulous and untested. Marianne Holdzkom, The Conversation, 12 Mar. 2025 See All Example Sentences for nebulous

Word History

Etymology

Latin nebulosus misty, from nebula

First Known Use

1674, in the meaning defined at sense 1

Time Traveler
The first known use of nebulous was in 1674

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Cite this Entry

“Nebulous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nebulous. Accessed 23 Mar. 2025.

Kids Definition

nebulous

adjective
neb·​u·​lous ˈneb-yə-ləs How to pronounce nebulous (audio)
1
: of, relating to, or resembling a nebula
2
: not clear or sharp : vague
nebulously adverb
nebulousness noun

More from Merriam-Webster on nebulous

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