convincing (adj)

It was a convincing excuse.
His well-reasoned arguments and supporting evidence were convincing enough to sway the opinions of many in the audience.
The salesperson's convincing demonstration of the product's features persuaded potential customers to make a purchase.
The student gave a convincing presentation, showcasing thorough research and a clear understanding of the topic.
The lawyer presented a convincing case in court, leading to a favorable verdict for the defendant.