The spelling of the word "canninesses" is a challenge for many. The correct pronunciation is /kəˈnɪnəsəz/. The word is derived from the noun "canniness," which means cleverness or shrewdness. The "-ness" suffix is added to form a noun that means the state or quality of being canny. The double "n" in "canniness" is maintained in the plural form, resulting in the unusual spelling of "canninesses." Despite its tricky spelling, this word can add a touch of sophistication to one's vocabulary.