Strong's Greek #1596 - ἑκουσίως hekousiós (voluntarily)

willfully, willingly.

Adverb from the same as hekousion; voluntarily -- wilfully, willingly.

see GREEK hekousion

Strong's 1596: ἑκουσίως

ἑκουσίως, adverb (from Euripides down), voluntarily, willingly, of one's own accord: Hebrews 10:26 (ἑκουσίως ἁμαρτάνειν (A. V. to sin willfully) is tacitly opposed to sins committed inconsiderately, and from ignorance or from weakness); 1 Peter 5:2.

Strong's Greek: 1596. ἑκουσίως (hekousiós) — 2 Occurrences

Hebrews 10:26 - Adv
GRK: Ἑκουσίως γὰρ ἁμαρτανόντων
NAS: For if we go on sinning willfully after
KJV: sin wilfully after
INT: [if] willingly indeed sin

1 Peter 5:2 - Adv
GRK: ἀναγκαστῶς ἀλλὰ ἑκουσίως κατὰ θεόν
NAS: not under compulsion, but voluntarily, according
KJV: but willingly; not
INT: by constraint but willingly according to God