Usefully, needfully, necessarily.

Usefully, profitably, duly; necessarily.

With reference to a particular action, or course of action: more appropriately, suitably, advisedly, or usefully.

As it behoves one; usefully, appropriately.

In a useful manner; to a useful end or purpose; beneficially, profitably, serviceably.

In such a way as to be of service or of use; so as to fulfil a particular function or purpose; usefully.