durably

the word "durably" is built upon the latin root 'dur-', from the verb 'durare', meaning "to harden, to last". this root itself is derived from the latin adjective 'durus', meaning "hard", which traces back to the proto-indo-european root 'deru-/dreu-', signifying firmness and solidity, as seen in words like "tree" and "true". the suffix '-ably' is a double-layered adverbial marker, originating from the latin '-abilis' (capable of) which passed into english via old french '-able', and then combined with the adverbial '-ly'. thus, the literal construction "in a manner able to last" evolved into the modern abstract meaning of performing an action with lasting endurance.

Structure: dur (sense) + ably (sense) dur: from latin 'durare' (to last, to harden), meaning "to last, endure". ably: from latin '-abilis' (able to be) via old french '-able' and english '-ably', an adverbial suffix meaning "in a manner that can be".