(adj.adv.) : incrēdĭbĭlis, e, adj.2. in-credo.
* Pass.
* That cannot be believed, incredible, extraordinary, unparalleled (class.): fides,Cic. Fam. 13, 54: quaedam et prope singularis et divina vis ingenii,id. Or. 1, 38, 172: voluptas,id. Cat. 1, 10: foedus sceleris,id. ib. 2, 4: furor,id. Sull. 27: rem facere incredibilem,id. Inv. 2, 13, 42: incredibilia probabilibus intexere,id. Part. 4, 12: incredibile est,it is incredible,id. Att. 13, 23, 3: praeter spem atque incredibile hoc mihi obtigit,unforeseen,Ter. Phorm. 2, 1, 9: incredibile est, quanta me molestia affecerit,Cic. Att. 15, 1, 1; so Quint. 1, 1, 32. —With inf.: incredibile est, a filio patrem occisum,Quint. 7, 2, 31: incredibilem in modum concursus fiunt,Cic. Att. 5, 16, 3: incredibile quantum coaluere,Just. 36, 2 fin.—With sup. in u (not in Cic.): incredibile memoratu est, quam facile coaluerint,Sall. C. 6, 2.
* Act., unbelieving, incredulous (post-class.): incredibiles cogentur credere,App. Trim. p. 93, 25.— Hence, adv.: incrēdĭbĭlĭter, incredibly, extraordinarily (class.): quibus ego incredibiliter delector,Cic. de Sen. 15, 51: consentire,id. Phil. 1, 15, 36: pertimuit,id. Att. 8, 7, 1.

s. TLL