beneficial

beneficial is an   Adverb

Definition:

[1] Conferring benefits; useful; profito. The war which would have been most beneficial to us. Swift.

[2] Receiving, or entitled to have or receive, advantage, use, or benefit; as, the beneficial owner of an estate. Kent.

[3] King. [Obs.] "A beneficial foe." B. Jonson.

Synonyms: