How Do You Spell SIMULTANEOUSNESSES?
Pronunciation: [sˌɪməltˈe͡ɪni͡əsnəsɪz] (IPA) 
The word "simultaneousnesses" is a mouthful to spell, and its pronunciation is equally challenging. In IPA phonetic transcription, "sɪməlˈteɪniəsnəsɪz" represents the sounds of this word. The first syllable is pronounced with a short "i" sound, followed by a long "e" sound in the second syllable. The stress falls on the third syllable, where the two "t" sounds are pronounced with a glottal stop. The final "-es" is added to make the word plural. Despite its complexity, this word is still used in technical and scientific writing to describe occurrences happening at the same time.
