Brutalist architecture is a style of architecture which flourished from the 1950s to the mid 1970s, spawned from the modernist architectural movement. The English architects Alison and Peter Smithson coined the term in 1954, from the French béton brut, or “raw concrete”, a phrase used by Le Corbusier to describe the poured board-marked concrete with which he constructed many of his post WWII buildings.

via en.wikipedia.org