The phrase "wast desirous of" is an archaic way of saying "you desired" in modern English. The spelling may seem confusing, but using the International Phonetic Alphabet (IPA) makes it easier to understand. "Wast" is pronounced as /wɑst/, with a long "a" sound like "wahst." "Desirous" is pronounced as /dɪˈzaɪrəs/, with the stress on the second syllable and a long "i" sound in "desi." Overall, the phrase sounds like "wahst dih-zai-ruhss of" in modern pronunciation.