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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

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

Century Dictionary and Cyclopedia

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

Wiktionary

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

GNU Webster's 1913

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

WordNet 3.0

  1. adj. lacking definite form or limits
  2. adj. lacking definition or definite content
  3. adj. of or relating to or resembling a nebula

Etymologies

  1. Middle English, from Latin nebulōsus, from nebula, cloud; see nebh- in Indo-European roots.

Examples

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‘nebulous’ has been looked up 3044 times, loved by 18 people, added to 137 lists, and has a Scrabble score of 10.