Asking non-native English speakers.

Does it count if English just steals your words?

Schadenfreude, Zeitgeist, Weltanschauung, Kindergarten.

Perhaps if the meaning is different or altered from the actual word.

Blitzkrieg?

Doppelganger, wanderlust, poltergeist...

Shaka, when the walls fell

Keeping in mind that any and all concepts in this world can be explained and understood by anyone and everyone - and that when this is untrue, only a lack of language and experience are at work - these do not have straightforward counterparts in English with the exact same nuance, I think:

Japanese
潔い、木漏れ日、懐かしい、いただきます、ごちそうさま、よろしく、お疲れ様、儚い、ぼけ、つっこみ、花見、紅葉狩り

Swedish
Mångata, lagom, fika, smörgåsbord, ombudsman, klämdag, skadeglädje, orka (verb or exclamation)

Hungarian
Meglehetős(en), káröröm

Blitzkrieg translates pretty well doesn't it? Fast war?

In Spanish.
Sobremesa, the period you stay at the table after lunch or dinner having a coffee or some drinks while chatting.

Aprovechar, is basically the opposite of to waste. So depending on the context is to take advantage of something, to make the most of, make a good use, give a second use or reuse leftovers for something else.

Bukkake.

Timba, his arms wide

Guten Appetit! (German term equivalent to "cheers" for drinking - but for eating.)

Doch

Zwedgsche (this fruit is often translated as sour cherry but it isnt a sour cherry)
Zipfelklatscher

German and high german dialects

That one is really interesting, because a lot of languages has it, from guten apetit, through dobrou chuť to itadakimasu. But english was out of school that day I suppose.

English stole 'Bon Apetit" from French fair and square!

Russian is more productive than English, so there's a bunch of "we just smushed a bunch of prefixes and suffixes on it" words that don't have a great English equivalent, like недоперепить -- to drink quite a lot but not succeed at drinking too much. I don't think we properly have листопад which is the equivalent of "snowfall" but for autumn leaves. I really miss успевать -- to successfully have enough time to do something. There's also кипяток -- water that has been boiled but then slightly cooled, like 200-205 degrees F. The canonical examples are тоска , which is a kind of melancholy longing, and авось which expresses optimism but I basically never heard anyone actually say.

Angst, although that one became more of a false friend: Fear of the unknown vs Teenage BS

Never hearing anyone express optimism feels like a very Russian stereotype.

As English often does - if it makes sense in another language and is easy for English speakers to understand the context it's used, they're quite happy stealing it. Especially French.

Loanwords are a thing in every language, especially English loanwords.

Lanche, the meal between lunch and dinner

In JavaScript, this.

You could at least describe the words... not everybody speaks German

Lightning being the literal translation but used in the same way as fast.

Buddhist devs meditate frequently on the differences and similarities between this and self

What language is that?

Fjøs is where farm animals are kept. "Barn" is more general and translates to "Låve", while Fjøs doesn't really have an English translation.

Nisse is a mythological creature that is part goblin, part santa, part Gnome, but not really either of them. They're usually benign and pretty cool.

Hygge (noun) /hyggelig (adjective) means having a cosy, lighthearted or fun atmosphere, usually in company of others

EDIT: By the way, Nissen lives in the Låve

Zeitgeist works well as "spirit of the times"; Weltanschauung as "worldview"; and Kindergarten as "pre-school".

Hygge became too popular so that's started making it's way into English. Hopefully that one sticks around. The pronunciation will never be correct though. Nisse sounds awesome though.

What's the difference between a Låve and a Fjøs?

Portuguese

Good appetite?

Oh, looked it up, it's not used in the same manner as German, i never knew 😃

Gezellig in Dutch. Used to describe a situation that's cosy and fun togetherness. Can also be used to describe a place that looks inviting (to have that good time in). I guess 😃

Fjøs is specifically where animals are kept. Låve is more generic, but it's usually where you store stuff such as hay and produce. Sometimes the two are combined into one building and It's common to refer to the ground floor as Fjøs, and the floor above as Låve.

Fjoøs ≈ Paddock or Corral ?

I always assumed lightning war was just a way of making it sound more interesting, I didn't realise blitz just meant lightning

Kind of, but referring more to the building itself.

Hinh in Burmese. The closest equivalent is curry, and while all curries are hinh, not every hinh is curry. It basically means something you eat with the rice.

It does seem on-brand.

Hygge=gezelligheid

Javertus. (Danish)

It's a thing that sticks out, and you don't know what it is, but it has the function of sticking out. Like a naturally occurring bulgy peak or other unknown long shape coming out of something else.

It's most often used as slang for penis, but otherwise it might be found on trees or wooden objects.

It's the word extroverts use to blackmail people into coming to social gatherings.

It's just the noun-form of the verb "kakeru", in this context, to pour or splash a liquid, with the intensifier "bu" in front of it to suggest it's done forcefully. Like in bukkake udon, where the broth is splashed onto the udon noodles.

"Linner" in English, as the obvious counterpart to "brunch."

Looking forward to "woonerf."

It also has a certain other, rather more precisely defined, meaning.

Second one is "appreciate" in English.

Sisu. Its a mix of courage, determination, resilience, keeping your nerve, doing a scary or difficult thing even though you know that odds of succeeding are low. Its also done quietly, no complaining or boasting about it. You can mutter some curse words quietly to yourself.

Closest English word for it might be "guts" or "grit". But those don't really explain it completely.

Finnish.

झूठा खाना/पानी (Jhootha khana/pani)

Food/water that is cosumed by someone else and hence is unsuitable for eating/drinking. Especially for religious or devotional rituals.

In the similar vein, https://en.wikipedia.org/wiki/Prasada

お疲れ様 (good job+"you look tired"+"I an acknowledging this and presenting recognition of your effort")

Keigo modifiers. ご覧 vs 見る. They both mean "look". One is, somehow, more polite.

Kansai dialect. しばいたろか ("wanna get smacked?" but it's playful) or まいど ("thanks" but also "nice to see you again" and "hello" but only in specific contexts between specific people. Mess it up and you'll probably hear the other Kansai term previously described.)

I think авось has a general meaning similar to "god willing", or "with some luck", not simply some optimism. Like "авось успеем" -> "with some luck, we can make it in time". I do agree it's an old-fashioned word which I haven't really heard in a while.

I know this one. From the title of the movie about one of your lads exacting cinematic vengeance on Nazis.

Beautiful stuff. 💛