INFRANGIBLE
absolute, infrangible, inviolable
(adjective) not capable of being violated or infringed; “infrangible human rights”
infrangible
(adjective) difficult or impossible to break or separate into parts; “an infrangible series”
Source: WordNet® 3.1
Etymology
Adjective
infrangible (comparative more infrangible, superlative most infrangible)
Unbreakable, indestructible, or very difficult to break.
Source: Wiktionary
In*fran"gi*ble, a. Etym: [Pref. in- not + grangible: cf.F.
infrangible.]
1. Not capable of being broken or separated into parts; as,
infrangible atoms.
[He] link'd their fetlocks with a golden band Infrangible. Pope.
2. Not to be infringed or violated.
Source: Webster’s Unabridged Dictionary 1913 Edition