Select the most appropriate ANTONYM of the underlined word in the given…

Concept

An antonym is a word that expresses the opposite meaning of another word in the sense required by its context. A word may have several senses, so the sentence must be used to select the relevant opposite.

Application

Here, obtuse describes a comment as lacking perceptiveness or intellectual sharpness. Sharp can describe thought or expression that is perceptive and mentally acute; it therefore provides the opposite sense.

Contrast

• Redundant means unnecessary or repetitious; it concerns necessity rather than perceptiveness.

• Blunt may mean lacking sharpness and is close to the dull sense rather than its opposite.

• Vague means unclear or imprecise and does not express mental acuity.

Cross-check

Replacing obtuse with sharp gives a sharp comment, which describes a perceptive remark and reverses the intended quality.

Result

Therefore, the most appropriate antonym is Sharp.