ἐθελόκακος
From LSJ
To χάρις ὑμῖν οὕτω τίθησιν κτλ. → Thus he writes joy to you all, etc. (Cramer's Catena on 1 Thessalonians 1.1)
English (LSJ)
ον,
A = κακὰ θέλων, Hsch. II guilty of wilful cowardice, of soldiers, τὸ τῶν στρατιωτῶν ἐ. D.H.9.7. Adv. -κως App.Ital.7Fr.