Definition of NEBULOUS

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Nebulous comes from the Latin word nebulosus, meaning "misty," which in turn comes from nebula, meaning "mist," "fog," or "cloud." In the 18th century, English speakers borrowed "nebula" and gave it a somewhat more specific meaning than the Latin version. In English, "nebula" refers to a cloud of gas or dust in deep space, or in less technical contexts, simply to a galaxy. "Nebulous" itself, when it doesn't have interstellar implications, usually means "cloudy" or "foggy" in a figurative sense. One's memory of a long-past event, for example, will often be nebulous; a teenager might give a nebulous recounting of an evening's events upon coming home; or a politician might make a campaign promise but give only a nebulous description of how he or she would fulfill it.

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

Despite the excited, headlong rush of the writing—not since Humbert Humbert has so much impassioned prose been lavished on so nebulous a love-object—the overall tone is elegiac. — John Banville, WSJ, "‘Sleeping With Strangers’ Review: Flickers of Desire," 22 Feb. 2019 Such nebulous criticism seems almost of another time—at once totally unfounded, wildly unnecessary, and more than a little sexist. — Elizabeth Holmes, Town & Country, "Anne Hathaway Is Nobody's Punching Bag," 8 Jan. 2019 The plea agreement states that Thompson’s attacks caused $95,000 in damage, although that’s likely a fairly nebulous estimate. — Adi Robertson, The Verge, "The man behind a spree of gaming network cyberattacks has pleaded guilty," 7 Nov. 2018 This is an area hazier than gray and more nebulous than fog. — Tamar Adler, Vogue, "Is Healthy Snack Food Actually Healthy—or Just Addictive?," 18 Jan. 2019 For nebulous reasons, my husband wavered and then backed out at the last minute. — Carolyn Hax, The Seattle Times, "There are exceptions to the ‘leave-him-to-it rule’," 14 Aug. 2018 Both constructs are nebulous and, in a dynamic economy constantly buffeted by myriad cross currents, impossible for central bankers to control. — Amar Bhidé, WSJ, "Congress Should Set the Fed’s Inflation Target—Ideally at Zero," 6 Nov. 2018 These complicated, nebulous aspects of personality disorders mean that attempting to diagnose them even in a professional setting requires extreme care and caution. — Carolyn L. Todd, SELF, "What Mental Health Experts Want You to Know Before Watching the Buzzy New YouTube Series ‘The Mind of Jake Paul’," 12 Oct. 2018 The nebulous installation will be swirling around from August 11 through October 31 at five different locations. — Lauren Decarlo, Condé Nast Traveler, "What to Do in Boston in August 2018," 8 Aug. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'nebulous.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.