>The longest (regular) word in Serbian is "prestolonaslednikovica"... 22 characters/sounds, and though it's a construct, it's still a regular word. Here's how:
>- presto - throne
>- naslediti - to inherit
>- naslednik - heir
>- prestolonaslednik - heir to the throne
>- prestolonaslednikovica - his wife.
>
>When counting the length of the nouns, we usually take nominative only, or else this wouldn't be the longest one. If we did, "prestolonaslednikovičinih" (genitive plural of possesive adjective derived from the noun, i.e. "of throne heir wife's") would be a candidate. Still, just miserable 25 character. Can't beat "elektromotorotekercselés" (electric motor rewinding) that I saw advertised on a fence in Hungary, with 24 characters without any suffixes. And in Hungarian, it's easier to get suffixes added than to breathe.

You Serbs!

The longest in English is:

pneumonoultramicroscopicsilivolcaniconiosis

a miner's lung disease. But not really regularly used. But there is:

floccipaucinihilipilification,

the act of regarding something as useless, so I guess you can floccipaucinihilipilificate someone.