The word "uncommonnesses" can be a bit tricky to spell, as it has several syllables and includes some less common letter combinations. The IPA phonetic transcription for this word is /ʌnˈkɒmənnəsɪz/. The stress falls on the second syllable, with the first syllable pronounced as "un" (like the word "up"), and the third syllable includes the "mm" sound. The "nesses" at the end of the word may also pose a challenge, with the "es" being pronounced as a separate syllable.