persistent Synonyms - page 2

still stiff-necked seamless sticking steady steadfastly staunch stationary retentive undeterred tough-minded hard-working unswerving unflagging nonvolatile neurotoxic stubbornly monthlong stabile confirmed age-long rock-ribbed yearlong unrelieved unfluctuating unwearying unfaltering unabated surefooted unstoppable steady-going obsessive longstanding long-standing never-ending unending unceasing uninterrupted untiring unhesitating weariless vigorous urgent unwearied unchanging unalterable unchangeable long-term unwavering long-lasting