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Adjective: nebulous  ne-byu-lus
  1. Lacking definite form or limits
    "nebulous distinction between pride and conceit";
    - cloudy, nebulose
  2. Lacking definition or definite content
    "nebulous reasons";
    - unfixed
  3. (astronomy) of or relating to or resembling a nebula
    "the nebulous hypothesis of the origin of the solar system";
    - nebular

See also: indefinite, indistinct

Encyclopedia: Nebulous