Sacrosanct – Unchallegeable; inviolate; too important or too special to change.
The sacred robe stank (sacrosanct) but it couldn't be cleaned – it was too special and important to risk washing it.
Examples of sacrosanct in a sentence
John's collection of ancient books was sacrosanct – no one else was allowed to touch them.
Sunday afternoon naps were sacrosanct for Joan – she resented anyone making a sound.
The president of the golf club said the rules were sacrosanct and could not be changed to suit any members' whims.