The word "athanasias" is a bit tricky to spell, as it contains some uncommon consonant clusters and vowel combinations. The correct way to spell it is /əˈθænəsiəs/. The first syllable starts with a schwa sound, followed by "th" and "a" pronounced as in "hat". The second syllable contains "na" as in "banana", followed by "si" as in "sit". Finally, the word ends with "as" as in "gas", and a stressed "ia" pronounced as "eye-ya".