The correct spelling of the phrase "haddest wrong impression" is HAD+est WRONG+imPRESSION, with the stressed syllables indicated by capital letters. IPA phonetic transcription for this phrase would be /ˈhæd.ɪst ˈrɔŋ ɪmˈprɛʃ.ən/. The use of "haddest" as the past tense of "have" and the inclusion of "est" as a grammatical ending in older English can result in confusion when spelling the phrase. However, accurate pronunciation can be achieved by breaking down the word into its syllables and examining the stress patterns.