Strong's G1596 — ἑκουσίως (adverb)
hekousios (hek-ou-see'-ose) adv.
1. willingly, voluntarily
[adverb from a derivative from G1635]
KJV: wilfully, willingly 
Root(s): G1635 
See also: G1595 
Hebrew root: ἑκών
Occurrences: 2