A compelling argument or reason is one that convinces you that something is true or that something should be done.
双语例句
例：
Factual and forensic evidence makes a suicide verdict the most compelling answer to the mystery of his death.
事实证据和法庭证据表明，自杀的判定是对他死亡之谜最令人信服的解答。
例：
The evidence was so compelling that the central Government did not have to force this change; it was willingly accepted.
中央政府没有必要强制实施变革，因为有令人信服的证据，变革就会为人乐意接受。
2.?引人入胜的
If you describe something such as a film or book, or someone's appearance, as compelling, you mean you want to keep looking at it or reading it because you find it so interesting.