The spelling of the word "wast liable" follows the archaic English language style. "Wast" is the second-person singular past tense of "be," while "liable" means "responsible or accountable." The correct IPA phonetic transcription for "wast" is /wɑːst/. The spelling "wast" is rarely used in modern English, and "were" is generally accepted in its place. However, it is essential to understand and acknowledge the variations in language throughout history to appreciate today's spoken and written language fully.