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implacável, inabalável, inexorável, inflexível, severo implacable, inexorable, sever   grim, inexorable, relentless, stern, unappeasable, unforgiving, unrelenting   impitoyable, inexorable firme, inelutable, inelutábel, inexorable, inexorábel implacable, inexorable, severo
constante, firme, inabalável constant, ferm, inalterable, irrompible, resolut   firm, steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering   déterminé, inébranlable firme constante, firme, inalterable, inquebrantable, irrompible