sacrilege

noun

1. (uncountable, usually)Desecration, profanation, misuse or violation of something regarded as sacred.

   “I recall the height of comfort attained by the green-cushioned "first" with starched white antimacassars and a pretentious grey floor mat on which it seemed a sacrilege to stand, as it was embellished with the North Western conception of Britannia, complete with trident.”