Incapable of producing results; doomed not to be successful; not worth attempting.

In a futile manner.

futility

(uncountable) The quality of being futile or useless. / (countable) Something, especially an act, that is futile. / (uncountable) Unimportance.

plural of futility

(obsolete) futile; trifling

A course of action doomed to be futile.

plural of exercise in futility

superlative form of futile: most futile