στυγερῶς
[adv. fr. στυγερός.]
In dire wise, so as to entail bitter consequences, so as to make a person rue his presumption or his falling short in something : ς. κε πολέμου ἀπερωήσειας Il. 16.723 : ς. κέ τινα πέμψαιμι νέεσθαι Od. 21.374. Cf. Od. 23.23.