The spelling of the word "wast unfaithful" may seem unfamiliar or archaic to modern readers. It is an example of Early Modern English, which was spoken in England from the late 15th century to the mid-17th century. The "wast" component is the archaic second person singular past tense of "to be," while "unfaithful" retains its modern meaning. In IPA phonetic transcription, "wast" would be pronounced /wɑst/ and "unfaithful" as /ʌnˈfeɪθfʊl/.