Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Cloudy, misty, or hazy.
  • adj. Lacking definite form or limits; vague: nebulous assurances of future cooperation.
  • adj. Of, relating to, or characteristic of a nebula.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. In the form of a cloud or haze; hazy.
  • adj. Vague or ill-defined.
  • adj. Relating to a nebula or nebulae.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Cloudy; hazy; misty.
  • adj. Of, pertaining to, or having the appearance of, a nebula; nebular; cloudlike.

from The Century Dictionary and Cyclopedia

  • Cloudy; hazy: used literally or figuratively.
  • In astronomy, pertaining to a nebula; having the appearance of a nebula; nebular.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. lacking definite form or limits
  • adj. lacking definition or definite content
  • adj. of or relating to or resembling a nebula

Etymologies

Middle English, from Latin nebulōsus, from nebula, cloud; see nebh- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English, from Latin nebulōsus ("full of mist, foggy, cloudy"), from nebula ("mist, vapour, cloud"), from Proto-Indo-European *nébʰos (“cloud, vapor, fog, moist, sky”). Cognate with Ancient Greek νέφος (néphos, "cloud"), Old High German nebul ("cloud, fog") (German Nebel), Old English nifol, neowol ("dark, gloomy, obscure, precipitous, prone"). More at neveling, nuel. (Wiktionary)

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