noun
a person or thing that is unshakable
adjective
not able to be shaken or disturbed
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Her unshakable dedication to her work earned her a promotion.
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I have an unshakable feeling that everything will turn out fine.
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No matter what happens, I've got an unshakable vibe about this.
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The foundation of their friendship was unshakable, like a rock in a stormy sea.