Lewis & Short

irrĕprĕhensĭbĭlis (inr-), e, adj. [2. in-reprehendo], unblamable, irreprehensible (post-class.), Arn. 2, 53 (with inculpabiles): mandatum, Tert. Res. Carn. 23; Vulg. 1 Tim. 6, 14.
Adv.: irrĕprĕhensĭbĭlĭter, unblamably, Claud. Mam. Stat. Anim. 1, 3, 7.