ἐθελόκακος

ον, κως, Adv.
A. = κακὰ θέλων, Hsch.
II. guilty of wilful cowardice, of soldiers, τὸ τῶν στρατιωτῶν ἐ. D.H. 9.7. Adv. -κως App. Ital.7Fr.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project