The word ”astute” means having or showing an ability to accurately assess situations or people and turn this to one’s advantage. An antonym would be ”ingenuous,” which implies a lack of sophistication or shrewdness. Thus, the correct answer is option 3.
• sharp (1): This is incorrect; it is similar in meaning to ”astute.”
• brilliant (2): This is incorrect; it is also similar in meaning to ”astute.”
• ingenuous(3): This is correct; it means innocent and unsuspecting, the opposite of astute.
• prudent (4): This is incorrect; it refers to being wise and careful, similar to astute.