Sacrosanct means so sacred that it must never be touched or changed. A sacrosanct principle, nothing is sacrosanct, treated as sacrosanct.
It is used most often in the negative, and saying nothing is sacrosanct is how any review announces that everything is up for change. The Latin joins sacred and holy, which is as strong as the language could make it.
1adjectivesacrosanctSo sacred that it must never be touched or changed.
“In our house, Sunday lunch together is sacrosanct; nobody is allowed to miss it.”
sacrosanct is a quality.
SACROsanct → too SACRED to touch
It is treated as sacred, and nobody is allowed to touch it, let alone change it.
hooks ontosacred
Latin
sacrōsānctus
English, today
sacrosanct
Learned borrowing from Latin sacrōsānctus.
Etymology from Wiktionary, CC BY-SA