(adj): impossible to assail
(adj): immune to attack; incapable of being tampered with
(adj): vs. vulnerable) -- (immune to attack; impregnable
(adj): must be kept sacred
(adj): vs. profane) -- (concerned with religion or religious purposes
(adj): not capable of being violated or infringed
(adj): vs. alienable), unalienable -- (incapable of being repudiated or transferred to another
