Brutalism - béton brut ("raw concrete") and art brut ("raw art") https://en.wikipedia.org/wiki/Brutalist_architecture

Though the common modern understanding of it does lend itself to 'brute'. I think one of the real issues was the post WWII era of 1950s to 1980s was a time of focus on low cost construction with an overconfidence in the forgiving nature of concrete combined with a fair amount of corruption in the factory supplied components - at least in the UK which I'm more familiar with.

It can be done well, and I point to the Barbican in London as an example. With better construction techniques it can last a lot longer with less maintenance cost.