caducus

Etymology
From.

Adjective

 * 1) That falls or has fallen, falling, collapsing, tottering, drooping.
 * 2) That easily falls, inclined to fall
 * 3)  Devoted to death, destined to die, doomed.
 * 4)  Frail, fleeting, perishable, transitory; vain, futile.
 * 5)  Lapsed, vacant, escheatable, caducary.