Step 1: Understand the meaning of "Clever."
"Clever" means intelligent, quick to understand, or skillful. The opposite of this would be someone who lacks intelligence or skills.
Step 2: Analyze each option.
- (A) Angry: Incorrect. "Angry" refers to an emotion, not intelligence.
- (B) Cunning: Incorrect. "Cunning" refers to skillful deception, which is not the opposite of "clever."
- (C) Naughty: Incorrect. "Naughty" refers to misbehavior, not intelligence.
- (D) Stupid: Correct. "Stupid" refers to a lack of intelligence, making it the antonym of "clever."
Step 3: Conclusion.
The correct antonym of "clever" is "stupid."