Synonyms of the word

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.

carbon

• n. (uncountable) The chemical element (symbol C) with an atomic number of 6.
• n. (countable) An atom of this element, in reference to a molecule containing it.
• n. (countable, informal) A sheet of carbon paper.
• n. (countable, informal) A carbon copy.
• n. A fossil fuel that is made of impure carbon such as coal or charcoal.
• n. (ecology, uncountable) Carbon dioxide, in the context of global warming and climate change.
• n. A carbon rod or pencil used in an arc lamp.
• n. A plate or piece of carbon used as one of the elements of a voltaic battery.

diamond

• n. (uncountable) A glimmering glass-like mineral that is an allotrope of carbon in which each atom is surrounded…
• n. A gemstone made from this mineral.
• n. A ring containing a diamond.
• n. A very pale blue color/colour.
• n. Something that resembles a diamond.
• n. (geometry) A rhombus, especially when oriented so that its longer axis is vertical.
• n. (geometry) The polyiamond made up of two triangles.
• n. (baseball) The entire field of play used in the game.
• n. (baseball) The infield of a baseball field.
• n. (card games) A card of the diamonds suit.
• n. (printing, uncountable, dated) A size of type, standardised as 4½ point.
• adj. made of, or containing diamond, a diamond or diamonds.
• adj. of, relating to, or being a sixtieth anniversary.
• adj. of, relating to, or being a seventy-fifth anniversary.
• adj. (slang) First-rate; excellent.
• v. to adorn with or as if with diamonds.
• n. (printing, dated) The size of type between brilliant and pearl, standardized as 4½-point.

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.

intransigent

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