1. vague, unclear, or lacking definite form
2. resembling or consisting of a cloud or mist
Usage: astronomy; literary

Examples

• The company’s future plans remain nebulous.
• She gave only a nebulous explanation for her absence.
• The contract contained several nebulous clauses that worried the lawyers.
• His nebulous ideas about the project made it difficult to move forward.
• The nebulous outline of mountains appeared through the fog.
• The telescope revealed a nebulous cluster of distant stars.