nebulous
adjective
1. lacking definite form or limits
- nebulous distinction between pride and conceit
Similar word(s): indistinct, cloudy, nebulose
2. of or relating to or resembling a nebula
- the nebular hypothesis of the origin of the solar system
Similar word(s): nebular
3. lacking definition or definite content
- nebulous reasons
Similar word(s): indefinite, unfixed