The spelling of the word "unsuccesses" may seem unusual, but it follows the standard English rules for forming negative words by adding the prefix "un-" to a root word. In this case, the root word is "success," which is pronounced /səkˈsɛs/ in IPA phonetic transcription. When the prefix "un-" is added, it changes the pronunciation of the word to /ʌnsəkˈsɛsɪz/. Despite its uncommon appearance, "unsuccesses" is a legitimate word that means lack of success or failure.