Similar word to severest:

astringent, austere, biting, caustic, close, cold, cruel, cutting, disapproving, dour, earnest, firm, flinty, forbidding, grave, grim, hard, hard-nosed, harsh, inconsiderate, inexorable, inflexible, iron-handed, obdurate, oppressive, peremptory, pitiless, relentless, resolute, resolved, rigid, satirical, scathing, serious, sober, stern, stiff, strait-laced, strict, tight-lipped, unalterable, unbending, unchanging, unfeeling, unrelenting, unsmiling, unsparing


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