not having a precise meaning

Vague terms like ‘sort of’ have no place in scientific reports

not clearly expressed; stated in indefinite terms

All this amounts to is a few vague accusations of impropriety

not thinking, or expressing one's thoughts, clearly or precisely

not clearly defined, known, grasped, or understood; indistinct

She has only a vague idea of what happened

not clearly felt or sensed

He felt a vague longing for a baked potato

not sharply outlined; hazy

He could make out a vague shape in the mist, which he assumed to be a sheep

not alert; absentminded

lacking expression; vacant

That vague look on his face drives me mad!