The word "brawninesses" may seem intimidating to spell at first, but its structure follows standard English rules. The first syllable, "brawn," is pronounced /brɔːn/ with a long 'o' sound. The suffix "-iness" adds a noun form of the adjective "brawny," meaning strong or muscular. Finally, the plural "-es" ending indicates that there are multiple instances of this noun. Therefore, "brawninesses" is correctly spelled as /ˈbrɔː.ni.nəs.ɪz/ with four syllables and a stress on the first.