tenable

adjective

1. capable of being held, maintained, or defended, as against attack or dispute: a tenable theory.
2. capable of being occupied, possessed, held, or enjoyed, as under certain conditions: a research grant tenable for two years.

adjective

1. able to be upheld, believed, maintained, or defended

adj.1570s, from Middle French tenable, from Old French (12c.), from tenir “to hold,” from Latin tenere “hold, keep” (see tenet).