The word "propitiousnesses" is quite a mouthful with its 16 letters and 6 syllables. The spelling of this word can be explained using IPA phonetic transcription as follows: /prəˈpɪʃəsnɪsɪz/. The stress falls on the second syllable, "pish", and the final "-es" is pronounced as /ɪz/. The addition of "-ness" and "-es" suffixes create a plural noun from the adjective "propitious", meaning favorable or auspicious. Overall, the spelling of "propitiousnesses" may seem daunting, but it is a valid English word with a precise definition.