Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
exaerĕsĭmus, a, um, adj., = ἐξαιρέσιμος, that may be omitted, taken out: quod suos dies mensisque congruere volunt … non numquam eximant unum aliquem diem ex mense: quos illi exairesimos dies nominant, Cic. Verr. 2, 2, 52. § 129.