The spelling of "haddest aspects of" can be tricky for English learners as it contains an archaic form of the word "had" and a plural noun "aspects". The correct IPA transcription would be /ˈhædɪst ˈæspekts ɒv/. The word "haddest" is the past tense of "have" in its archaic form, which is rarely used in modern English. "Aspects" is pronounced with a short "a" sound as in "cat" followed by the stressed syllable "-spekts".