Usefully synonyms

Though all true cast iron is brittle, in the sense that it is not usefully malleable, i.e.

Economics, therefore, under modern conditions, is not only a subject which may usefully occupy the attention of a leisured class of scientific men.

We know, in short, that the water is not being usefully employed.

Clarke, when he, as superintendent of the Royal Carriage Factory, had brought gun mountings to such a pitch of perfection that it could be usefully employed.

Deficits can be transferred to the capital account, and the country's resources employed most usefully by repaying liabilities contracted in times of extreme need.