Sacred means (1) "dedicated to the worship of a deity"; (2) "declared holy"; (3) "dedicated to a single purpose, person, or use"; (4) "worthy of respect": "He took a sacred oath never to bear arms against anyone." "This is a monument sacred to the memory of a great person." "Everyone's right to life is sacred." "All great festival occasions of the church are sacred in their celebration." Sacrosanct means especially and particularly "sacred," "incorruptible and unassailable," "incapable of being violated": "The most sacrosanct part of the church is its sanctuary." "The constitutional rights of free speech, free press, and free assembly are considered sacrosanct by all American citizens."
Dictionary of problem words and expressions. Harry Shaw. 1975.