theoretical (and not thinking about practical problems)

dogmatic, opinionated

determined and stubborn when trying to solve or complete something

determined, persistent

difficult to control; refusing advice

stubborn

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

stubborn

stubborn

pig-headed, stubborn

not easily agreeing to an argument or being persuaded; stubborn

stubborn, determined

(of a person) deliberately continuing to do wrong; (of behaviour) unreasonable

mean, ornery; troublesome

demanding and enforcing obedience; severe; strict; the back end (of a ship or boat)

serious, authoritarian

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

obstinate, unyielding

holding tightly; very determined to get or keep something, be successful in winning an argument etc

strong, unyielding

not hesitating

steadfast

not easily controlled or guided

contrary, unmanageable

(of a person) determined to have one's own way; intentional

stubborn, obstinate