I’ve always thought of brutalism as the ultimate “function over form.” It’s brutal in the sense that it “brutally” strips away the form until all that’s left is the function. It’s like minimalism without the vanity.
e: ah, in this very thread https://secretgeek.github.io/html_wysiwyg/html.html
Umm...the French word you're looking for is "beton". The rest of the thread has plenty of (correct) definitions of "brut" for reference.