(a.) Able to endure or continue in a particular condition; lasting; not perishable or changeable; not wearing out or decaying soon; enduring; as, durable cloth; durable happiness.

abiding adamantine age-long aged ancient antique bulky cartilaginous changeless chewy chronic cohesive constant continuing coriaceous dense dependable diuturnal enduring evergreen fast fibrous firm fixed frozen gristly hard hardy heavy immobile immutable indestructible intact intransient inveterate inviolate lasting leatherlike leathery long-lasting long-lived long-standing long-term longeval longevous macrobiotic massive of long duration of long standing perdurable perduring perennial permanent perpetual persistent persisting quiescent reliable remaining resistant rigid ropy rugged sempervirent sinewy solid sound stable static stationary staying steadfast steady stiff stout stringy strong stubborn sturdy substantial sustained tenacious torpid tough tough as leather unaltered unchangeable unchanged unchanging unchecked undestroyed unfading unfailing unshifting untiring unvaried unvarying unyielding vigorous viscid vital well-built well-constructed well-founded well-grounded well-made wiry