The word "numerousnesses" is a mouthful to pronounce, and its spelling can be tricky to remember. The IPA phonetic transcription of this word is /ˈnjuːmərəsnəsɪz/. The correct spelling includes two "s" letters within the word and adds a suffix "-es" to form the plural. The root word "numerous" means a large number of something, and by adding the suffix "-ness," it becomes a noun form to mean the state of being numerous. By adding the plural suffix "-es," it means the condition of having multiple states of being numerous.