inefficacious

the treatment proved to be inefficacious against the virus.

many people found the new policy inefficacious in addressing the issue.

the medication was deemed inefficacious after several trials.

his efforts to change the situation were largely inefficacious.

they realized their approach was inefficacious and needed to be revised.

critics argue that the reforms are inefficacious and superficial.

the committee found the previous strategies to be inefficacious.

despite the funding, the project remained inefficacious.

some believe that traditional methods are often inefficacious in modern contexts.

the team's inefficacious tactics led to their defeat.