Explanation
The word "gregarious" means sociable or fond of company, so its opposite is "lonesome," which describes a state of being alone or isolated. "Talkative" and "cheerful" are not direct antonyms, while "boring" is unrelated to sociability.
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The word "gregarious" means sociable or fond of company, so its opposite is "lonesome," which describes a state of being alone or isolated. "Talkative" and "cheerful" are not direct antonyms, while "boring" is unrelated to sociability.