The word "noxiousnesses" is spelled with a combination of unique sounds. The initial "n" is pronounced with the phonetic symbol /n/, then followed by "ox" with the sound /ɑks/. The "ious" is pronounced as a blend of /i/ and /əs/. The final "nesses" is pronounced with a long "e" /ni:s/ followed by a soft "s" sound /səz/. Together, these sounds create the spelling of "noxiousnesses," which refers to the state of being harmful or poisonous.
The word "noxiousnesses" does not have a specific etymology since it is not a recognized English word. "Noxiousness" is a noun form of the adjective "noxious", which means harmful, toxic, or very unpleasant. However, the addition of the plural "-es" and the repeated "s" at the end of the word "noxiousnesses" does not conform to standard English grammar rules. It appears to be a non-standard or incorrect formation.