Lewis & Short

in-culpābĭlis, e, adj., unblamable, blameless (post-class.): numen, Prud. Apoth. 1015: mores, Avien. Arat. 28: lapis, i. e. faultless, without a flaw, Sol. 30.
Adv.: inculpābĭlĭter, without blame, Cassiod. Var. 5, 27; 11, 18 sq.