strenuously

In a strenuous manner.

[W]hen Chauvin’s trial for his alleged role in Floyd’s death begins, much of the argument will center instead on the autopsy details, most specifically whether fentanyl and underlying health conditions — not the police officer’s actions — stopped Floyd’s heart and lungs. Seven experts in toxicology, cardiology and illegal drug use consulted by The Washington Post largely disagreed with that idea, most of them strenuously.