Lewis Short
(adjective) : importābĭlis (inp-), e, 2. inportabilis
* That cannot be borne, insupportable; lit. and trop. (late Lat.), Tert. adv. Marc. 4, 27 med.: moenium arietes,Cassiod. Var. 7, 6: malum,id. ib. 9, 2 al. — Adv.: importābĭlĭter, in an insupportable manner: omnia contra eos facientes,Cassiod. Hist. Eccl. 7, 29.
Charlton T. Lewis, Charles Short, A Latin Dictionary