1) Durable 2) Enduring 3) French word used in English 4) Imputrescible 5) Indestructible 6) Not perishable 7) Not subject to decay 8) Perdurable 9) Unceasing 10) Undestroyable Found on https://www.crosswordclues.com/clue/imperishable
Im·per'ish·a·ble adjective [ Prefix im- not + perishable : confer French impérissable .] Not perishable; not subject to decay; indestructible; enduring permanently; as, an imperishable monument; imperishable renown. -- Im*per'ish*a*ble*ness , Found on http://www.encyclo.co.uk/webster/I/19