Correct Answer: Flawed

Solution : The correct choice is the first option.

The word "ideal" refers to something that is conceived as perfect. "Flawed" means something that has blemishes or shortcomings, making it the antonym of "ideal".

The meanings of the other words are:

• Excellent: It denotes something very good or of high quality.
• Fitting: It means appropriate.
• Optimal: It denotes the best or most favourable.

Therefore, the right answer is flawed .