Something that's nebulous is clouded or hazy. When you walk through the woods on a foggy morning, the trees may all have a mysterious, nebulous look to them.

When you fly in a plane on an overcast day, the land below you looks nebulous and indistinct. You can also use nebulous in a more figurative way, to describe vague ideas or fuzzy concepts. Nebulous comes from the Latin nebulosus, "cloudy, misty, or foggy." Its root is nebula, which is "vapor or fog" in Latin and was adopted by astronomers in the 1700s to mean "a cloud of gas and dust in outer space."

Definitions of nebulous
  1. adjective
    lacking definite form or limits
    nebulous distinction between pride and conceit”
    synonyms: cloudy, nebulose
    not clearly defined or easy to perceive or understand
  2. adjective
    lacking definition or definite content
    nebulous reasons”
    synonyms: unfixed
    vague or not clearly defined or stated
  3. adjective
    of or relating to or resembling a nebula
    synonyms: nebular
Word Family