Collocations for vague - adj.

be, look, sound
‘Where did you leave it?’ Isobel looked vague.

become, get
She seems to be getting rather vague as she grows older.

remain
leave sth
The identity of the city in the novel is deliberately left vague.

extremely, fairly, very, etc.
hopelessly
Her directions were hopelessly vague.

a little, slightly, etc.
enough, sufficiently
It was a vague enough suggestion for everyone to be happy with it.

suitably
deliberately, intentionally
You're being deliberately vague.

necessarily
Since the officers knew little themselves their reassurances were necessarily vague.

notoriously
The law is notoriously vague on this point.

frustratingly

about
I am vague about what happened during the rest of the night.

as to
I was suitably vague as to exactly how I had acquired the money.

in
The statement was vague in its wording.

Vague is used with these nouns:
allusion, answer, concept, description, feeling, generalization, gesture, hint, hope, idea, impression, language, law, memory, notion, outline, possibility, promise, recollection, reference, semblance, sense, shape, suggestion, suspicion, term, unease, wording