"Antidisestablishmentarianism" is commonly believed to be the longest word in English (not counting coined and technical terms).
At 28 letters and 12 syllables, it's quite the mouthful. As it turns out, though, it looks kind of short next to the longest word in some other languages.
For instance: according to the video above, created by the German Language School in Berlin, the longest word in Dutch is "kindercarnavalsoptochtvoorbereidingswerkzaamheden," which translates as "preparation activities for a children's carnival procession."
And then there's the longest Swedish word, "spårvagnsaktiebolagsskensmutsskjutarefackföreningspersonalbeklädnad" which means "the supply of uniforms to the personnel of the track cleaners' union of the tramway company." It's 77 letters long.
The Language School admits in the video's description that some of these words may not be definitively the longest in their respective languages, but they write, "it's fun to listen to anyway!"
By the way, if you are counting coined and technical terms, here's a word that's a lot longer than "antidisestablishmentarianism": the name of one protein runs to 189,819 letters.
If you really want to, you can watch a three-and-a-half hour video of a guy pronouncing it over at PR Daily.
Via Daily of the Day