irrefutably
🇺🇸
/ˌɪrɪˈfjuːtəbli/
🇬🇧
/ˌɪrɪˈfjuːtəbli/
completely and undeniably true
The scientist presented irrefutably that the new vaccine was safe and effective.
科学家确凿地证明了新疫苗是安全有效的。