Synonyms of the word

intransigent

• adj. Unwilling to compromise or moderate a position; unreasonable; irreconcilable; stubborn.
• n. A person who is intransigent.

adamant

• adj. Firm; unshakeable; unyielding; determined.
• adj. (of an object) Similar to the adamant; very difficult to break, pierce, or cut.
• n. An imaginary rock or mineral of impenetrable hardness; a name given to the diamond and other substances…
• n. An embodiment of impregnable hardness.
• n. A magnet; a lodestone.

adamantine

• adj. Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated.
• adj. Like the diamond in hardness or luster.

inexorable

• adj. Unable to be persuaded; relentless; unrelenting.
• adj. Impossible to stop or prevent; inevitable.
• adj. Adamant; severe.

inflexible

• adj. Not flexible; not capable of bending or being bent; stiff; rigid; firm; unyielding.
• adj. Not willing to change, e.g. one's opinion or habits; obstinate; stubborn; resolute; determined.