vague (adj) – not clear, not enough details or information
vaguely (adv) – in a vague way, in a not clear manner
1. The water in the river became vague after the rain.
2. The project was vaguely explained in the meeting.
3. His question was vague so I found it hard to answer it.
4. That desciption is too vague, you need to be more specific.