If someone's behaviour or actions are sacrilegious, they show great disrespect towards something holy or towards something that people think should be respected. A number of churches were sacked and sacrilegious acts committed
grossly irreverent toward what is held to be sacred; "blasphemous rites of a witches' Sabbath"; "profane utterances against the Church"; "it is sacrilegious to enter with shoes on"
Violating sacred things; polluted with sacrilege; involving sacrilege; profane; impious