Vague, unclear, or ill-defined; lacking definite form or limits. Nebulous ideas or concepts are hazy and difficult to grasp precisely.
From Latin 'nebulosus' meaning 'misty, foggy,' from 'nebula' meaning 'mist' or 'cloud.' Astronomers still use 'nebula' for cosmic clouds of gas and dust, and the figurative meaning captures that same sense of something visible but without clear boundaries.
Picture a nebula in space - you can see it's there, but you can't tell where it starts or ends. Nebulous ideas are like that cosmic fog: present but impossible to pin down. When your friend gives you 'nebulous' directions, you'll end up as lost as an astronaut in a gas cloud.
Complete word intelligence in one call. Free tier — 50 lookups/day.