Varun's major weakness in this interview was his lack of detailed responses and failure to engage with the questions meaningfully. His answers were too brief and did not include examples or explanations that would demonstrate his knowledge and skills. This is particularly concerning for a role that requires strong communication skills and the ability to articulate complex information clearly and effectively. Varun could improve by providing more comprehensive answers, using specific examples from his past experiences, and demonstrating how his skills align with the job requirements.