The spelling of the word "unaching" can be explained using the International Phonetic Alphabet (IPA). The first syllable "un-" is pronounced as "ʌn", with a short "u" sound. The second syllable "-ach-" is pronounced as "eɪk", with a long "a" sound followed by a "k" sound. Finally, the last syllable "-ing" is pronounced as "ɪŋ", with a "ih" sound followed by an "ng" sound. Together, the word "unaching" is pronounced as "ʌn.eɪk.ɪŋ".