sustained Synonyms

constant steady prolonged enduring durable unbroken ongoing continuous incessant continued maintained steadfast persistent stable uninterrupted staying supported sustainable tenacious tolerated regular suffered relentless rigid running subacute settled stationary stubborn unremitting drawn-out long-term long-standing stabile validated time-consuming unfluctuating unrelieved free burning long-lasting Antiguan upheld surefooted unceasing never-ending unyielding unalterable round the clock nonstop kept up