Adiapexia is not a common word, but it refers to a medical condition where someone experiences a sustained loss of appetite. The word is spelled with the prefix "adi," meaning absence or lack, and "apexia," meaning appetite. The first syllable is pronounced as "uh-di" with a schwa sound (ə), and the second syllable is pronounced as "uh-pek-see-uh," with stress on the third syllable. The IPA transcription for adiapexia is /ədɪəˈpɛksiə/.