Step 1: Meaning of ‘better’.
The word “better” is the comparative degree of “good.” It means of higher quality or improved condition.
Step 2: Finding the antonym.
- The antonym of “good” is “bad.”
- The antonym of “better” (comparative form) is “worse” (comparative form of “bad”).
Step 3: Analyzing options.
- Worse: Correct, opposite of “better.”
- Bad: Opposite of “good,” not of “better.”
- Worst: Superlative form, not the antonym of “better.”
- (Good: Related word, not opposite.
Step 4: Conclusion.
Thus, the antonym of “better” is “worse.”
Final Answer:
\[
\boxed{\text{worse}}
\]