Lewis & Short

imputrĭbĭlis (inp-), e, adj. [2. in-putresco], not liable to decay, incorruptible (late Lat.): ligna, Hier. Ep. 64, 9; Aug. Psa. 95; id. Civ. Dei, 21, 7.
Adv.: imputrĭbĭ-lĭter, incorruptibly, Aug. Ep. 32 ad Paul.