Strong's #1596: hekousios (pronounced hek-oo-see'-ose)

adverb from the same as 1595; voluntarily:--wilfully, willingly.

Thayer's Greek Lexicon:

̔́

hekousiōs

1) voluntarily, willingly, of one' s own accord

1a) to sin wilfully as opposed to sins committed inconsiderately, and from ignorance or from weakness

Part of Speech: adverb

Relation: from the same as G1595

Usage:

This word is used 2 times:

 

Hebrews 10:26: "For if we sin willfully after that we have received the knowledge of the"
1 Peter 5:2: "thereof, not by constraint, but willingly; not for filthy lucre, but of a ready mind;"