Floccinaucinihilipilification

The action or habit of estimating something as worthless

Esternocleidomastoideo (Spanish)

Sternocleidomastoid, muscle of the neck

Antidisestablishmentarianism

Opposition to the disestablishment of the Church of England

Pneumonoultramicroscopicsilicovolcanoconiosis

Lung disease caused by the inhalation of silica or quartz dust

Rindfleischetikettierungsüberwachungsaufgabenübertragungsgesetz (German)

The law for the delegation of monitoring beef labeling

Nghiêng (Japanese, this is the longest write word without a space)

Pseudopseudohypoparathyroidism

A mild form of inherited pseudohypoparathyroidism that simulates the symptoms of the disorder but isn’t associated with abnormal levels of calcium and phosphorus in the blood

Rechtsschutzversicherungsgesellschaften (German)

Insurance companies providing legal protection

Supercalifragilisticexpialidocious

When you have nothing to say

Realisationsvinstbeskattning (Swedish)

Capital gain taxation

Incomprehensibilities

Difficult or impossible to understand or comprehend

Interdisciplinariedad (Spanish)

Interdisciplinary, combining or involving two or more academic disciplines or fields of study

Sesquipedalianism

The practice of using long, sometimes obscure, words in speech or writing

Nordösterssjökustartilleriflygspaningssimulatoranläggningsmaterielunderhållsuppföljningssystemdiskussionsinläggningsförberedelsearbeten (Swedish)

Coast artillery flight searching simulator area material maintaining follow-up system discussion preparation tasks of the Northern Baltic Sea

Hippopotomonstrosesquipedaliophobia

Fear of long words