Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
imperspĭcābĭlis (inp-), e, adj. [2. inperspicabilis], that cannot be seen through, inscrutable, incomprehensible: majestas, Cassiod. de An. 3; Ambros. de Fide, 3, 14, § 110.