An incisive comment can be described as?

An incisive comment is characterized by being clear, direct, and cutting; it cuts to the heart of a matter effectively. The term 'incisive' specifically implies sharpness and decisiveness in thought or expression, often revealing deeper truths that may not be immediately obvious. This type of comment is typically straightforward and can at times come across as harsh, as it may confront uncomfortable aspects of a situation or topic without sugarcoating.

In this context, supportive, gentle, and vague descriptions do not resonate with the meaning of incisive. Supportive implies a sense of encouragement or affirmation, gentleness denotes a soft and tactful approach, and vagueness suggests a lack of clarity or precision—all characteristics that contrast sharply with the decisiveness and directness inherent in an incisive comment.