The word "opaquenesses" is a noun form of the adjective "opaque," which means not transparent or translucent. The spelling of this word can be broken down into the following IPA phonetic transcriptions: /oʊˈpeɪkwənəsɪz/. The stress falls on the second syllable, and the vowel sound is a diphthong of "o" and "e." The word ends in "-nesses," which means the quality of being opaque. Despite its complexity, the spelling of "opaquenesses" is a good example of how English can be a challenging language to master.