The Oxford Thesaurus An A-Z Dictionary of Synonyms - persistentadj.

1) persisting, persevering, tenacious, steadfast, firm, fast, fixed, staunch, resolute, resolved, determined, unfaltering, unswerving, undeviating, unflagging, tireless, untiring, indefatigable, dogged, unwavering, stubborn, obstinate, obdurate, inflexible, rigid: He was persistent in his demands for justice. The inspector never gave up his persistent pursuit of criminals. 2) continuing, constant, continuous, continual, unending, interminable, unremitting, unrelenting, perpetual, incessant, unceasing, non-stop: The persistent rainy weather began to depress us. At last he gave in to her persistent complaints and bought a washing machine.