dull
rogue
ardent
shrewd
Answer is Right!
Answer is Wrong!
The correct answer is dull.
A keen person is sharp, intelligent, and perceptive. A dull person is not sharp, intelligent, or perceptive.
A rogue is a dishonest or unscrupulous person. A rogue is not necessarily dull, but they may be dishonest or unscrupulous.
An ardent person is very enthusiastic or passionate about something. An ardent person is not necessarily dull, but they may be very enthusiastic or passionate about something.
A shrewd person is clever and cunning. A shrewd person is not necessarily dull, but they may be clever and cunning.
In conclusion, the correct answer is dull.