A primer of “brutalism” from Wikipedia:
Brutalist architecture is a movement in architecture that flourished from the 1950s to the mid-1970s, descending from the modernist architectural movement of the early 20th century. The term originates from the French word for “raw” in the term used by Le Corbusier to describe his choice of material béton brut (raw concrete). British architectural critic Reyner Banham adapted the term into “brutalism” (originally “New Brutalism”) to identify the emerging style.
With the ethos transferred to web design, we get a “ruggedness and lack of concern to look comfortable or easy”, according to Brutalist Websites, a compendium of sites with nothing but the basics at hand. You won’t see any fancy fonts or state of the art CSS on these web pages. Some look archaic but on the whole, they bring web design back to the barebones and it’s quite refreshing.