This word came into English from French, but the original root is in the Latin “infrangibilis.” “In-” means “not” and “frangere” means “to break.” At first glance, it might be easy to mistake “infrangible” with the similarly spelled “intangible”; however, they have entirely different meanings and usages. To be infrangible is to be unbreakable, whereas something that’s intangible is unable to be broken, because it doesn’t have a physical presence.