Strong’s Greek
G4290 — prothumos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
προθύμως
prothumos — pronounced proth-oo'-moce
adverb from 4289; with alacrity:--willingly. see GREEK for 4289
1 occurrence in the KJV.
1 Peter 5:2
Feed the flock of God which is among you, taking the oversight thereof, not by constraint, but willingly; not for filthy lucre, but of a ready mind;