- cloudy, nebulose, nebulous - lacking definite form or limits; "gropes among cloudy issues toward a feeble conclusion"- H.T.Moore; "nebulous distinction between pride and conceit"
Antonym: distinct (indirect, via indistinct)
- nebulous, unfixed - lacking definition or definite content; "nebulous reasons"; "unfixed as were her general notions of what men ought to be"- Jane Austen
Antonym: definite (indirect, via indefinite)