The spelling of "hast bad" is incorrect as there is no word in the English language with this spelling. The word "hast" is an old contraction of "have" and is pronounced /hæst/ in IPA phonetic transcription. Meanwhile, "bad" is an adjective that describes something of poor quality and is pronounced /bæd/. It is important to use proper spelling and pronunciation in written and verbal communication to convey accurate meaning and avoid confusion.