Sacred and sacrosanct both suggest deep respect, but they are not interchangeable.
Sacred usually describes something holy, religious, or profoundly revered. It often has a spiritual sense, though it can also describe something personally precious. You might say, The river is sacred to the tribe or Family recipes felt sacred to her grandmother.
Sacrosanct means protected from violation, criticism, or interference. It is often used for rules, rights, principles, or boundaries that people treat as untouchable. For example, Patient confidentiality is sacrosanct or The constitution is not sacrosanct, but it is deeply respected.
- Use sacred for holiness, worship, or deep reverence.
- Use sacrosanct for something treated as inviolable.
A simple way to remember it is this: sacred points to what is holy, while sacrosanct points to what must not be violated.