Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sēpărābĭlis, e, adj. [separo], that may be separated, separable: nec (eam vim) separabilem a corpore esse, Cic. Tusc. 1, 10, 21; a veritate unius Dei, Hilar Trin. 1, 16 fin.