Varun's main weakness in this interview was his failure to provide substantive answers that demonstrate his qualifications and experiences relevant to the job role. His responses lacked detail and did not engage with the specifics of the questions asked, which is crucial for a role that requires strong communication and stakeholder management skills. To improve, Varun could focus on elaborating his answers, providing specific examples from his past roles, and showing a clear understanding of how his experience aligns with the responsibilities of the Product Manager position at Adzip Technologies.