1. Supportable.
2. Défendable.
ETYM Cf. French supportable.
Capable of being supported, maintained, or endured.
ETYM Cf. French soutenable, Old Fren. soustenable.
Capable of being sustained.
Capable of being continued indefinitely. For example, the sustainable yield of a forest is equivalent to the amount that grows back. Environmentalists made the term a catchword, in advocating the sustainable use of resources.