uncompromising

Unwilling to grant concessions or negotiate; inflexible.

Not compromising; admitting of no compromise; not complying; inflexible; unyielding: as, uncompromising hostility.

Not admitting of compromise; making no truce or concessions; obstinate; unyielding; inflexible.

inflexible and unwilling to negotiate or make concessions

principled

not making concessions