Nebulous

1. adjective

   lacking definition or definite content; ; - Jane Austen

   “nebulous reasons”

   Similar: unfixed

2. adjective

   lacking definite form or limits; - H.T.Moore

   “gropes among cloudy issues toward a feeble conclusion”

   Similar: cloudy, nebulose

3. adjective

   of or relating to or resembling a nebula

   “the nebular hypothesis of the origin of the solar system”

   Similar: nebular