unerschütterlich — meaning in English

English meaning

adamant adj Refusing to change one's mind or position; firmly determined.
imperturbable adj Staying calm and steady, even in a stressful situation.
indomitable adjective Impossible to defeat, discourage, or bring under control.
stalwart adj Strongly and solidly built; sturdy.
unfazed adj Calm and not worried or troubled by something difficult or surprising.
unflappable adj Staying calm and unruffled in any situation, however stressful.
unshakable adj So firm or certain that it cannot be shaken, doubted, or destroyed.
unwavering adjective Steady and not shaken; firm and resolute.

unerschütterlich is used for these senses in English:

adamant (said of people and their conviction) Firm; unshakeable; unyielding; determined.
imperturbable Not capable of being, or not easily, perturbed, excited, or upset; calm and collected, even under pressure.
indomitable Incapable of being subdued, overcome, or vanquished.
stalwart Firmly or solidly built.
stalwart Courageous.
unfazed Not frightened or hesitant; undaunted; not put off; unimpressed.
unflappable Remaining composed and level-headed at all times; impossible to fluster; not becoming frustrated or irritated easily. [from 1954]
unshakable Not able to be shaken; firm, solid

adj Refusing to change one's mind or position; firmly determined.
noun A legendary stone or mineral once believed to be unbreakable, historically linked to diamond or lodestone.