efficaciousness

“Given the extraordinary efficaciousness of this vaccine, one can again follow the science and say that it’s very low risk if you’ve been vaccinated,” Kim-Farley said.

A friend of Homœopathy, not a physician, desired to test the efficaciousness of this plant.

Its autonomy supervenes on its efficaciousness; it does not precede its efficaciousness.

It held the men in the thralls of hypnotism, and in its efficaciousness depended the safety of the captain and his “loyal” adherents.

When garlic-juice is applied to a magnet, it loses its power of attraction, but remains a true magnet, and, when goat's blood is applied, immediately regains its efficaciousness.