The spelling of the word "haddest high opinion" can be explained through IPA phonetic transcription as /ˈhædɪst haɪ əˈpɪnjən/. The word "haddest" is an archaic form of "had", which is the past tense of "have". The pronunciation of "haddest" is similar to "had-ist", with the stress on the first syllable. "High" is pronounced as "hahy", with the vowel sound resembling that in "eye". "Opinion" is pronounced as "uh-pin-yuhn", with the stress on the second syllable. Overall, this phrase conveys the idea of having a very strong belief or judgment about something.