what's the longest english word in the dictionary? Do you really want to know? Pneumonoultramicroscopicsilicovolcanoconiosis Goo on, say it. Pneumonoultramicroscopicsilicovolcanoconiosis another really long word is electrophotomicrographically, I think we can settle on that one being easier to say. We then move onto these really horrible words Antidisestablishmentarianism , scopicsilicovolcanoconiosis , Floccinaucinihilipilification and Honorificabilitudini-tatibus. This one is latin, it means "with honor"