inviolable

UK: /ɪnˈvaɪələb^əl/ US: /ɪnˈvaɪələbəl/ ,(in vī′ə lə bəl)

WordReference Random House Learner's Dictionary of American English © 2025

in•vi•o•la•ble /ɪnˈvaɪələbəl/   adj. 

1. prohibiting violation;
   free and safe from destruction, violence, or misuse:
   an inviolable sanctuary.
2. that cannot be violated:
   inviolable secrecy.

in•vi•o•la•bil•i•ty, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2025

in•vi•o•la•ble  (in vī′ə lə bəl), adj. 

1. prohibiting violation;
   secure from destruction, violence, infringement, or desecration:
   an inviolable sanctuary; an inviolable promise.
2. incapable of being violated;
   incorruptible;
   unassailable:
   inviolable secrecy.

• Latin inviolābilis. See in-³, violable
• late Middle English 1400–50

in•vi′o•la•bil′i•ty, in•vi′o•la•ble•ness, n. 
in•vi′o•la•bly, adv. 

Collins Concise English Dictionary © HarperCollins Publishers::

inviolable / ɪnˈvaɪələb^əl/ adjective

1. that must not or cannot be transgressed, dishonoured, or broken; to be kept sacred: an inviolable oath

inˌviolaˈbility, inˈviolableness noun

inˈviolably adverb