εἰ μὴ ἦλθον καὶ ἐλάλησα αὐτοῖς, ἁμαρτίαν οὐκ εἶχον → if I had not come and spoken to them, they would not be guilty of sin
tardesco: ĕre,
I v. inch. n., to become slow: tardescit lingua, grows sluggish, hesitates, stammers, Lucr. 3, 479; Tib. 1, 4, 27.
tardēscō,¹⁶ dŭī, ĕre (tardus), intr., devenir lent, s’engourdir : Lucr. 3, 477 ; Tib. 1, 4, 27.