Abbott-Smith Manual Greek Lexicon
ἄκων (G210)
1 ἄκων (Attic contr. for ἀέκων ), -ουσα, -ον ( ἀ- neg., ἕκων , willing ), [in LXX: Jb 14:17 , II Mac 11:12 *;] unwilling : I Co 9:17 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain