Flydd's poultice proved efficacious, for Nish's wound was better in the morning.

Crawling on the floor proved efficacious, especially since the items being thrown about the room were all flying freely until they struck something, usually a wall.

You follow the world, my young friend, and I tremble lest grace prove not efficacious.

"I believe it will prove efficacious in the cure of the kelpwilt," Sorahl said simply.

In this case the method proved efficacious at once.

I am sure it will prove highly efficacious, my lord.

He clutched the protective pomander tight and hoped that it would prove efficacious against the plague.

It may not employ race-based means without considering race-neutral alternatives and employing them if they would prove efficacious.

Unlike before, the public were enthusiastically cooperative this time, the use of the word 'bomb' proving far more efficacious than the earlier 'please'.

"My companion Bolos are agreed on a means that should prove efficacious."