endure remain last persist exist extant living ongoing alive current residual vestigial abide continue perennial around existent durable firm stable permanent eternal constant prevail fix linger immortal persistent steady present steadfast undestroyed perpetual lifelong everlasting undying unending imperishable timeless establish ageless unchanging live contemporary stand dateless fast about active immutable operative functioning strong operate unwavere be run reliable go subsist work changeless unfaltere perdurable operational indissoluble functional sempiternal resilient unshakable tenacious immovable prevalent actual real on traditional ancient staunch animate nag gnaw niggle recurrent recur breathing ticking awake develop dynamic vigorous alert vital endless continual ceaseless indestructible incessant unceasing uninterrupted