Strong's G1635 · Greek

ἑκών

hekon · hek-own'

of uncertain affinity; voluntary

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 2 ἑκών , -οῦσα, -όν [in LXX: Ex 21:13 , Jb 36:19 * ;] willing, of one's own free will : Ro 8:20 , I Co 9:17 (Cremer, 246).† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain