οὐκ ἔστι λέουσι καὶ ἀνδράσιν ὅρκια πιστά → there are no pacts between lions and men, between lions and men there are no oaths of faith, there can be no covenants between men and lions
ăcerbe: adv., v. acerbus.
ăcerbē¹¹ (acerbus),
1 âprement, durement, cruellement : Cic. Verr. 2, 5, 19, etc.
2 péniblement : acerbe ferre aliquid Cic. Clu. 59 ; Cæs. G. 7, 17, 4, etc., supporter qqch. avec peine