inexorable

inexorable adjective adamant, convinced, decided, determined, dogged, firm, headstrong, immovable, immutable, implacable, indomitable, inexorabilis, inflexible, merciless, obdurate, obstinate, opinionated, persevering, persistent, persisting, pertinacious, pitiless, positive, relentless, resistant, resolute, resolved, set, severe, steadfast, steady, sternly just, strong-minded, strong-willed, stubborn, tenacious, unalterable, unbending, unchanging, uncompassionate, uncompromising, unfaltering, unimpressible, unmanageable, unmovable, unmoved by entreaties, unpersuadable, unrelenting, unshaken, unwavering, unyielding, willful

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See also: brutal, callous, certain, definite, dictatorial, immutable, imperative, implacable, inescapable, inevitable, inflexible, ironclad, irreconcilable, necessary, obdurate, peremptory, pertinacious, positive, relentless, resolute, rigid, ruthless, severe, stable, steadfast, strict, unavoidable, uncompromising, unrelenting, unyielding