"Wast evil" is not a correct spelling. However, "was't evil" could be a possible interpretation. It is an abbreviated form of "was it evil." IPA phonetic transcription for "was't" would be /wʌz ɪt/ - the "w" pronounced as in "wet," the vowel as in "cup," the "z" as in "zoo," and the "t" as in "cat." "Evil" is transcribed as /ˈiːvəl/ - the initial "e" pronounced as in "see," the vowel as in "bit," and the "l" pronounced as a dark "l."