The word "inoperativenesses" is a mouthful in terms of spelling! The phonetic transcription for this word is /ˌɪn.ɒpərətɪvnəsɪz/. It's made up of the prefix "in-" which means "not", "operativeness" which means the quality of being inoperative or not functioning properly, and the suffix "-es" which pluralizes the noun. Pronouncing each syllable with care can help to spell this word correctly, but in general, it's not a word you're likely to encounter very often!
The word "inoperativenesses" appears to be a derivative of the base word "inoperative" with the suffixes "-ness" and "-es" added to it. The etymology of "inoperative" can be traced back to the Latin word "inoperativus", which is derived from the combination of "in" (meaning "not") and "operativus" (meaning "operative").