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Synonyms
neb·u·lous (nĕb́yə-ləs)

[Middle English, from Latin nebulōsus, from nebula, cloud.]

adjective 

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

derivatives

neb́u·lous·ly
adverb
neb́u·lous·ness
noun