effectual

And when at last it is perceived that such pity cannot lead to effectual succor, common sense bids the soul be rid of it.

It is not a mere sprinkling that will do; it requires a forcible dashing to and fro, and that often repeated, to be effectual.

But before another week had passed an effectual end was put for many a day to all plans for the "repair of the cathedral."

The prudence of Stilicho conceived and executed, without delay, the most effectual measure for the relief of the Roman people.