Antonym of VAGUE

Answer: Option D

Vague : of uncertain, indefinite, or unclear character or meaning.
Known : recognized, familiar, or within the scope of knowledge.
Published : prepare and issue (a book, journal, or piece of music) for public sale.
Popular : liked or admired by many people or by a particular person or group.
Definite : clearly stated or decided; not vague or doubtful.

Antonym of Vague is Definite