Vague about and vague on are common when someone lacks detail or certainty about a topic. Vague in is used mainly to describe style or wording.
Use vague about or vague on for topics, facts, or plans. Use vague in to describe the way something is expressed or written.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use vague about when someone avoids or lacks detail about something.
Vague on often means not fully informed or uncertain about a subject.
Use vague in to identify where language or explanation lacks clarity.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Use about or on for the subject being discussed.
✕ She was vague in the budget. ✓ She was vague about the budget.Use in when describing where language is unclear.
✕ The report is vague on several paragraphs. ✓ The report is vague in several paragraphs.Vague usually needs a preposition before the topic.
✕ He was vague the details. ✓ He was vague about the details.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
Both are standard. About is broader, while on often relates to knowledge or expertise.
Usually it describes writing, speech, or explanation rather than a person directly.
Not usually. Say vague about the details or vague on the details.
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