(of a person, action) showing a serious wish to do something successfully

driven, persistent

determined and stubborn when trying to solve or complete something

determined, persistent

that cannot be bent; refusing to change or be influenced

stubborn

an animal that is the young of a horse and a donkey; a slipper without a heel

stubborn

often expressing (too much) confidence in one's own opinion

believing very strongly and conveying it

without pity (and determined)

cruel, merciless

stiff; that cannot be bent; firm; strict; not changing

stiff, strict, severe

firmly fixed; loyal

loyal, steady

(of a person) having a strong, determined will; difficult to deal

obstinate, unyielding

not prepared to make any compromise

stubborn