nebulous
1. [ adjective ] lacking definite form or limits
Synonyms: cloudy nebulose
Examples:

"gropes among cloudy issues toward a feeble conclusion"- H.T.Moore "nebulous distinction between pride and conceit"

Related terms: indistinct
2. [ adjective ] lacking definition or definite content
Synonyms: unfixed
Examples:

"nebulous reasons" "unfixed as were her general notions of what men ought to be"- Jane Austen

Related terms: indefinite
Similar spelling:   nebulously
  nebulose