The spelling of the word "Fidelix" can be explained using the International Phonetic Alphabet (IPA) transcription. The first syllable "Fi" is pronounced as /fi/ with a stress on the first letter. The second syllable "de" is pronounced as /dɛ/. Lastly, the last syllable "lix" is pronounced as /lɪks/. Altogether, the word is pronounced as /ˈfi.dɛ.lɪks/. The spelling of "Fidelix" is unique and may not follow the typical English pronunciation rules, which may make it challenging for non-native speakers.