Pronunciation: (vāg),[key] —adj.,va•guer, va•guest. 1. not clearly or explicitly stated or expressed: vague promises. 2. indefinite or indistinct in nature or character, as ideas or feelings: a vague premonition of disaster. 3. not clear or distinct to the sight or any other sense; perceptible or recognizable only in an indefinite way: vague shapes in the dark; vague murmurs behind a door. 4. not definitely established, determined, confirmed, or known; uncertain: a vague rumor; The date of his birth is vague. 5. (of persons) not clear or definite in thought, understanding, or expression: vague about his motives; a vague person. 6. (of the eyes, expression, etc.) showing lack of clear perception or understanding: a vague stare.