The spelling of the word "haddest disposal" can be explained using the International Phonetic Alphabet (IPA). "Haddest" is pronounced as /ˈhædɛst/, with stress on the first syllable. It is the second person singular past tense of "have," an old-fashioned verb meaning "to possess." "Disposal" is pronounced as /dɪsˈpoʊzəl/, with stress on the second syllable. It refers to the act of getting rid of something, or the management or distribution of resources. Together, "haddest disposal" means you had the ability to get rid of something or manage resources in the past.