The term astute describes someone who can accurately evaluate situations or individuals, using this skill to their benefit. It implies intelligence and perceptiveness.
An antonym is a word with an opposite meaning.
Let's consider the choices:
- sharp: This is a synonym for astute; it is not an antonym.
- brilliant: Although it signifies intelligence, it does not represent the opposite of astute.
- ingenuous: This term denotes innocence or a lack of guile, indicating the absence of cunning. It is the appropriate antonym.
- prudent: This refers to cautious and thoughtful planning for the future, not a direct opposite of astute.
Consequently, the accurate antonym for astute is: ingenuous.