impeccabilis

μήτε δίκην δικάσῃς πρίν ἀμφοῖν μῦθον ἀκούσῃς → do not give your judgement until you have heard a speech on both sides

Latin > English (Lewis & Short)

impeccābĭlis: (inp-), e, adj. 2. inpecco,
I faultless, sinless, impeccable, Gell. 17, 19, 6.