Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
incăpābĭlis, e, adj. [2. in-capio], incomprehensible (late Lat.): deus, Arrian. ap. Aug. Ep. 174; cf.: incapabilis ἀχώρητος, Gloss. Philox.