sacrosanct (adj.) Look up sacrosanct at Dictionary.com
"superlatively sacred or inviolable," c.1600, from Latin sacrosanctus "protected by religious sanction, consecrated with religious ceremonies," from sacro, ablative of sacrum "religious sanction" (from neuter singular of sacer "sacred") + sanctus, past participle of sancire "make sacred" (for both, see sacred). Earlier in partially anglicized form sacro-seint (c.1500).