Here are some of the most uncommon English words

An estimated 1.5billion people on the planet speak English, while more than 300million people have it as their first language. Inspired by this Quora thread, we look at some of its least common words.

Recumbentibus

"A knockdown blow."

Dyscalculia

"A severe difficulty in making simple mathematical calculations, due to cerebral disease or injury."

Spadish

"Direct and blunt in manner of expression."

Sciolist

"An amateur who engages in an activity without serious intentions and who pretends to have knowledge."

Purpurescent

"Tinged with purple."

Triboluminescence

"The production of light by friction."

Ninnyhammer

"A fool or simpleton."

Rapacious

"Having or showing a strong or excessive desire to acquire money or possess things."

Ozostomia

"Foul-smelling breath."

Slubberdegullion

"A slovenly or worthless person."

Clinomania

"An obsession with bed rest."

Saudade

"A feeling of longing, melancholy, or nostalgia that is supposedly characteristic of the Portuguese or Brazilian temperament."

Mattoid

"A person displaying eccentric behaviour and mental characteristics that approach the psychotic."

Querencia

"The part of a bullring where the bull takes its stand."

More: 10 made-up words to describe emotions that we should all start using immediately