1. (adj) firm, steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering
marked by firm determination or resolution; not shakable
Synonyms: staunch, stiff, slopped, pissed, steadfast, blind drunk, unfaltering, besotted, solid, buckram, blotto, pixilated, cockeyed, truehearted, fast(a), potent, unswerving, fast, fuddled, tight, soused, bulletproof, firm, unassailable, immobile, watertight, level, loyal, sozzled, unfluctuating, squiffy, unbendable, unshakable, soaked, unwavering, crocked, rigid, plastered, pie-eyed, sloshed, smashed, strong, starchy, loaded, wet, regular, steady
Antonyms: irresolute, contestable
2. (adj) unassailable, unshakable, watertight, bulletproof
without flaws or loopholes
Synonyms: unbendable, bulletproof, stiff, inviolable, unshakable, unfaltering, untouchable, watertight, steadfast, unwavering, unassailable, steady, firm, strong, unattackable, impregnable, secure
Antonyms: contestable, irresolute
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Synonyms and Antonyms of unshakable 
