persistent Synonyms - page 2

hard-working unswerving unflagging nonvolatile neurotoxic monthlong stabile obsessive longstanding tough-minded confirmed age-long unrelieved unfluctuating unwearying unfaltering unabated surefooted unstoppable steady-going rock-ribbed long-standing long-term never-ending unending unceasing uninterrupted untiring unhesitating weariless urgent unwearied unchanging unalterable unchangeable unwavering long-lasting run on unfading nonstop round the clock around the clock eonian undeviating unshakable indefatigable habitual froward frequent firm