(of a person, opinions, plans etc) that cannot reach an agreement

hostile, conflicting

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

believing very strongly and conveying it

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

stiff, strict, severe

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

serious, authoritarian

not prepared to make any compromise

stubborn