Too hard to be broken
Not compliant; not yielding; not pliant
Stubborn is defined as being unwilling to change your opinion or stance, in spite of good reasons to.
Firmly, often unreasonably immovable in purpose or will
Stubbornly resistant to change or unwaveringly loyal even in spite of inevitable defeat, failure, etc.
Grim is defined as stern or unmoving.
The definition of inexorable is a stubborn or inflexible person or a situation that cannot be changed.
Firm in mind or purpose; stubborn; unyielding; unshakable
The definition of iron is something that is strong and enduring.
Not easily moved to pity or sympathy; hardhearted
Having no pity or compassion; merciless.
Being an airship with a external frame made of rigid parts.
Unwilling to grant concessions or negotiate; inflexible:
Refusing to yield or relent; inflexible; relentless
Incapable of being changed; unalterable:
Find another word for adamantine. In this page you can discover 26 synonyms, antonyms, idiomatic expressions, and related words for adamantine, like: adamantean, adamant, brassbound, implacable, incompliant, relentless, stubborn, unbending, stubborn as a mule (or ox), resist and die-hard.