(a.) of long continuance; lasting.

age-long aged ancient antique changeless chronic commorant constant continuing continuous diuturnal durable dwelling enduring evergreen firm fixed frozen hardy immobile immutable in residence indefatigable intact intransient inveterate inviolate lasting living living in lodging long-lasting long-lived long-standing long-term longeval longevous macrobiotic never-failing of long duration of long standing perdurable perduring perennial permanent perpetual persistent persisting quiescent remaining resident residentiary residing rigid sempervirent solid stable static stationary staying steadfast steady sticking sustained torpid tough unaltered unceasing unchangeable unchanged unchanging unchecked undestroyed undying unfading unfailing unfaltering unqualified unquestioning unremitting unshifting unvaried unvarying vital wholehearted