решительный

1) General subject: absolute, all-out, all-outer, cataclysmic, categorical, crisp (об ответе, нраве), decided, decisive (о характере, человеке), definite, definitive, determinate, determined, drastic, fateful (по последствиям), feisty, firm, flat footed, flat-footed, forthright, hard set, manful, on (one's) toes, out front, out-front, overwhelming (о победе), pight, plucky, plump, point blank, point-blank, purposeful, purposive, resolute, resolved, set, smash, soldierly, stable, stalwart, stanch, staunch, stiff, stout, strong, strong minded, strong willed, strong-minded, strong-willed, two fisted, unfaltering, unflinching, unhesitating, vehement, smashing, square, sweeping, unwavering (AD), vigorous, vaulting, staunchest, assertive

2) Colloquial: gritty, can-do (Americans' drive and can-do approach)

3) American: ballsy

4) Poetical language: stark

5) Military: aggressive

6) Mathematics: irreversible, irrevocable

7) Diplomatic term: stubborn, sturdy, unqualified

8) Psychology: categoric

9) Jargon: sudden death

10) Makarov: apocalyptic, backboned, drastic (о мерах), flush, grim, hard-set, stiff in the back (о человеке), vigorous (о действиях)

11) Emotional: two-fisted