inviolablerule

noun

UK /ɪnˈvaɪələbl ruːl/

US /ɪnˈvaɪələbəl ruːl/

A rule that must never be broken.

Wearing a seatbelt is an inviolablerule in our family car.

SYNONYMS

unbreakable rule absolute rule sacred rule non-negotiable rule ironclad rule

RELATED WORDS

law commandment principle regulation mandate

OTHER MEANINGS

2. A principle that cannot be changed or questioned.

Honesty was an inviolablerule in their friendship.

3. A strict guideline that everyone must follow without exception.

The lab's inviolablerule kept everyone safe during experiments.

4. A deeply held belief that is treated as untouchable.

For the coach, respect for teammates was an inviolablerule.