This page is about the collocation vague idea
collocation pattern: adjective + noun
an approximate or imprecise idea
- I've got a vague idea of what time it was, but I can't remember exactly.
- I haven't read the book, but I've got a vague idea of what it's about.
Also "rough idea"
I've only got a vague idea of what she looks like because
Contributor: Matt Errey