Efficacious [adjective]

Some have already raised questions about Johnson & Johnson’s preliminary results, asking why people would take a vaccine that’s only 72 percent efficacious in the United States when the Pfizer and Moderna vaccines are 95 percent efficacious.

He inclines to the use of the tepid bath, as likely to be the most generally efficacious.

I know not how to offer advice, and I am incapable of giving any efficacious help.

I can say from experience, that it is a powerful sudorific, and very efficacious in a cold.

However much the theologian may believe in prayer, he cannot deny that it is less efficacious than action.

The commissioners regarded the land purchase act as embodying the most simple and efficacious remedy for existing evils.

He seems to recommend the powder dentifrices as more efficacious.

It is a matter of regret that this pigment is not equally efficacious in oil.

In the opinion of the Peruvian cultivators, this is the most efficacious kind.

The following is what he prescribes as efficacious for some of the most dire complaints with which cats are apt to be afflicted.