Adverb
In a useful manner.
Source: Webster's dictionaryOne travels more usefully when alone, because he reflects more. Thomas Jefferson
Self-criticism sessions were held, but these produced more criticism than could usefully be absorbed or accomodated. Donald Barthelme
Seldom can philosophic genius be more usefully employed than in thus rescuing admitted truths from the neglect caused by the very circumstance of their universal admission. Samuel Taylor Coleridge
I see philosophy as a fairly abstract activity, as concerned mainly with the analysis of criticism and concepts, and of course most usefully of scientific concepts. Alfred Jules Ayer
To contribute usefully to the advance of science, one must sometimes not disdain from undertaking simple verifications. Léon Foucault
[D]epression... can be usefully seen, from one point of view, as the inability to see or construct a future. Rollo May