im·mar·ces·ci·ble adjective orim·mar·ces·si·ble\|i(m)ˌmär|sesəbəl\ Etymology: Late Latin immarcescibilis, from Latin in- in- (I) + Late Latin marcescibilis withering, from Latin marcescere to wither, fade away + -ibilis -ible — more at marcescent : imperishable, indestructible • im·mar·ces·ci·blyorim·mar·ces·si·bly\-blē\adverb