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

grit, pluck, tirelessness, indefatigableness, indefatigability,
patience, endurance, diligence, devotion, tenacity, doggedness,
stubbornness, inflexibility, obstinacy, obstinateness,
obdurateness, Colloq guts, US stick-to-it-iveness: Perseverance
is essential for success in the theatre.
persevere v. Often, persevere in or with or at. persist, resolve, decide,
endure, continue, carry on or through, keep at or on or up, be
steadfast or staunch or constant, keep going, stand fast or
firm, see through, be or remain determined or resolved or
resolute or stalwart or purposeful or uncompromising, be
tenacious or persistent or constant or pertinacious or assiduous
or sedulous, be tireless or untiring or indefatigable, show
determination or pluck or grit, be plucky, be patient or
diligent or stubborn or inflexible or adamant or obstinate or
obdurate, show or exhibit or demonstrate patience or diligence
or stubbornness or inflexibility or obstinacy or obduracy,
remain dogged, pursue doggedly, be intransigent or intractable,
cling to, stick to, support, stop at nothing, sustain, Colloq
stick with, stick (it) out: We must persevere if we are to win.
I shall persevere in my loyalty.
persist v. 1 Often, persist in or at. persevere, be persistent, insist
(on), stand firm or fast, be steadfast or staunch, strive, toil,
labour, work (hard) (at): She persists in arguing her
innocence. Only those who persist will succeed. 2 remain,
continue, endure, carry on, keep up or on, last, linger, stay:
The bad weather persisted through the weekend.
persistence
n. perseverance, resolve, determination, resolution,
steadfastness, tenacity, constancy, assiduity, stamina,
tirelessness, indefatigability, indefatigableness, tirelessness,
pluck, grit, patience, diligence, pertinacity, doggedness,
stubbornness, obstinacy, obduracy: By sheer persistence he got
his own way.
persistent
adj. 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