What's the hardest word to pronounce in your language?

I find the word pneumonoultramicroscopicsilicovolcanoconiosis hard to say, we were learning about it in Biology

Humu humu nuku nuku apua'a is a fish!

превысокомногорассмотрительствующий.
Russian

"viskelær can be difficult meaning an eraser

Bringebærsyltetøy raspberryjam
Kjøttkakemiddag, meatloaf dinner
loads of food words can be very complicated

biangbiang面 (A kind of delicious noodles)
↑
The Chinese character is too complex to show.

Haar - a wonderful word for scrabble but not well known?

Loch of course is a shibboleth and marks you out as Scottish or English

A German word: "Eierschalensollbruchstellenverursacher",
something that you can use to open your breakfast egg perfectly.

Pneumonoultramicroscopicsilicovolcanoconiosis

One of the difficult languages to learn or pronounce a word is German, but I would like to learn

The classic: Chuchichäschtli✨

defribiliering (swedish)

Colonel… it is spoken like ‘Kernel’

"Rinder­kennzeichnungs- und Rindfleisch­etikettierungs­überwachungs­aufgaben­übertragungs­gesetz"

Not a joke - this monster was created by German officials to name a law. Well, yeah... who else can come up with such an idea? 😃

You need an explanation? Well, then have a look at this (including a Listening-Link):
https://en.wikipedia.org/wiki/Rinderkennzeichnungs-_und_Rindfleischetikettierungs%C3%BCberwachungsaufgaben%C3%BCbertragungsgesetz

"Otorrinolaringologia" which is the spanish word for the Health specialty for the Ears, Nose and Throat/ENT, which is way easier to refer to

Защищающийся. Zashchishchayushchijsya

I'll go with "otorrinolaringólogo", "paralelepípedo" and "esternocleidomastoideo".

(Until recently I didn't know how to say "frambuesa") 💀

For everybody from out of Switzerland its CHUCHICHÄSCHTLI.