The word "uncelestial" refers to something that is not related to the celestial or heavenly realm. The spelling of this word is broken down as follows: the prefix "un-" indicates a negation, followed by "celestial," which is pronounced /sɪˈlɛstʃəl/ and means heavenly or relating to the stars. Therefore, the phonetic transcription of "uncelestial" would be /ʌn.sɪˈlɛstʃəl/. This term can be used in various contexts, such as in discussions of astronomical phenomena or in philosophical debates about the nature of the universe.