G1754 ἐνεργέω (energéō)

KJV renderings: do, (be) effectual (fervent), be mighty in, shew forth self, work (effectually in)
Strong's definition: to be active, efficient
Derivation: from G1756 (ἐνεργής);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.