Le plus long mot

Albanian

zëvendëskryeredaktori 

(21 letters) deputy editor-in-chief

Kundërzhurmëkrijuesabërësave 

(27 letters) against noisemakers

Bulgarian

neprotivokonstitutsionstvuvatelstvuvayte 

(40 letters) something against constitution

Catalan

anticonstitucionalment 

(22 letters) unconstitutionally

Croatian

prijestolonaslijednikovica 

(26 letters) the wife of a heir to the throne

Czech

nejneobhospodarovávatelnejšími 

(30 letters) the less farmed

Danish

Speciallægepraksisplanlægningsstabiliseringsperiode  

(52 letters) period where a specialist doctors planning of the practice is stabilized

Økonomiprofessorassistentsuddannelse  

(36 letters) an education to be an assistant for a professor in economics

Dutch

kindercarnavalsoptochtvoorbereidingswerkzaamheden 

(48 letters) preparation activities for a children’s carnival procession

         hottentottententententoonstelling

(33 letters) the exhibition of the tents of the Hottentot-tribe

English

As for the English language, there are somewhat fanciful claims for extremely long words. However, more realistically here are the following in descending length:

pneumonoultramicroscopicsilicovolcanoconiosis 

(45 letters) the longest word in a major dictionary, a technical word for a lung disease created by silica dust inhalation

supercalifragilisticexpialidocious 

(34 letters) from the Mary Poppins film and musical with a fanciful defintion

hippopotomonstrosesquipedalianism 

(33 letters) which means the love of long words

pseudopseudohypoparathyroidism 

(30 letters) the longest non-coined word in a major dictionary for a specific inherited medical disorder

floccinaucinihilipilification 

(29 letters coined in 1741) meaning the categorizing of something that is useless or trivial (the longest unchallenged non-technical word)

antidisestablishmentarianism

(28 letters) the longest non-coined and non-technical word

          hippopotomonstrosesquipedaliophobia  

(35 letters) the fear of long words

Estonian

raudteeülesõidukoht

(19 letters) train crossing point

Finnish

lentokonesuihkuturbiinimoottoriapumekaanikkoaliupseerioppilas

(61 letters) technical warrant officer trainee specialized in aircraft jet engines

käsipyyherullajärjestelmä 

(25 letters) an automatic towel system for drying your hands

peruspalveluliikelaitoskuntayhtymä

(34 letters) a municipality providing basic services

metroraideliityntäpysäköintiyhdistelmäajoneuvoparkkialue

(56 letters) combined vehicles parking area with access to metro rail

French

anticonstitutionnellement 

(25 letters) unconstitutionally

intergouvernementalisation 

(26 letters) intergovernmentalisation

German

Grundstücksverkehrsgenehmigungszuständigkeitsübertragungsverordnung 

(67 letters) a regulation about competences

Donaudampfschifffahrtsgesellschaft 

(34 letters) Danube steamship company

Geschwindigkeitsbegrenzung 

(26 letters) speed limit

Greek

υποδηματοεπιδιορθωτήριον  

(24 letters) by mending shoes

ωτορινολαρυγγολόγος

(19 letters) otolaryngologist (throat-ear-nose specialist)

ακτινοχρυσοφαιδροβροντολαμπροφεγγοφωτοστόλιστος

(47 letters) dressed in golden-shining, thundering and incandescent clothes

σκουληκομυρμηγκότρυπα

(21 letters) an anthill

φαλαινοκαρχαρίας 

(16 letters) whale shark

Hungarian

megszentségtelenithetetlenségeskedéseltekért 

(44 letters) “for your unprofaneable actions”

legmegvesztegethetetlenebbek 

(28 letters) the least corruptible ones

Icelandic

vaðlaheiðarvegavinnuverkfærageymsluskúrslyklakippuhringurinn 

(60 letters) the key ring to the tool work shed in the road works of Vaðlaheiði

Italian

precipitevolissimevolmente 

(26 letters) to do something in a hurry

psiconeuroendocrinoimmunologia 

(30 letters) a discipline that deals with the relationship between the functioning of the nervous system, the immune system and the endocrine system

Latin

honorificabilitudinitatibus 

(27 letters) the state of being able to achieve honours (the longest word in Shakespeare from Love’s Labour’s Lost)

Latvian

pretpulksteņrādītājvirziens 

(28 letters) in a counter-clockwise direction

Virsapakšcepure 

(15 letters) underneath hat

Lithuanian

nebeprisikiškiakopusteliaudavome 

(30 letters) we didn't pick rabbit cabbage

Polish

konstantynopolitańczykowianeczka

(32 letters) a girl living in Constantinople

Portuguese

anticonstitucionalissimamente 

(29 letters) unconstitutionally

Romanian

otorinolaringologie 

(19 letters) Otorhinolaringology

sternocleidomastoidian 

(22 letters) the sternocleidomastoid muscle that is located in the front of the neck

pneumoultramicroscopicosilicovulcaniconioza 

(49 letters) pneumonoultramicroscopicsilicovolcaniconiosis. lung disease caused by inhalation of volcanic silicon dust

Russian

тетрагидропиранилциклопентилтетрагидропиридопиридиновые 

(55 letters) Chemical substance

Serbian

prestolonaslednikovica 

(22 letters) wife of the Crown Prince

деведесетдеветогодишњакиња 

(26 letters) a ninety-nine-year-old woman

Slovenian

dialektičnomaterialističen 

(26 letters) dialectical materialistic

starocerkvenoslovanšcina 

(24 letters) Old Church Slavik Language

Slovak

najnevypočítavatelnejší

(23 letters) the most difficult example to calculate

najneobhospodárovatel'nejší

(26 letters) the less farmed

Spanish

anticonstitucionalmente

(23 letters) unconstitutionally

(21 letters) person who favors or is part of the counter-revolution

          electroencefalografista

(23 letters)  electroencephalographists, specialists in the brain measurement technology of electroencephalography (EEG)

(131 letters) north west sea coastal artillery reconnaissance flight simulator facility equipment maintenance follow-up discussion posts preparatory work

(28 letters) They are said to belong to the family that came from Afyonkarahisar

Muvaffakiyetsizlestiricilestiriveremeyebileceklerimizdenmissinizcesine

(70 letters) As if you would be from those we can not easily/quickly make a maker of unsuccessful ones

çekostravakyalılardanmısınızsiz?

(31 letters) Are you from çekostravakyalı?

Ukranian

рентгеноелектрокардіографічного

(31 letters) x-ray electrocardiographic

Welsh

Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch

(58 letters) village on the island of Anglesey in Wales, literal meaning: St Mary's in Hollow of the White Hazel near to the Rapid Whirlpool of Llantysilio of the Red Cave