unshakable

Definitions of unshakable
1

adj marked by firm determination or resolution; not shakable

Synonyms:
firm, steadfast, steady, stiff, unbendable, unfaltering, unwavering
resolute
firm in purpose or belief; characterized by firmness and determination

adj without flaws or loopholes

Synonyms:
bulletproof, unassailable, watertight
incontestable, incontestible
incapable of being contested or disputed

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