Severe

Synonyms Acute, serious, critical, drastic, extreme, terrible, frightful, sore, worrying, dangerous, life-threatening, profound, fierce, strong, powerful, intense, turbulent, excruciating, unbearable, unendurable, shooting, thumping, very bad, grave, dire, grievous, dreadful, awful, appalling, alarming, distressing, perilous, peracute, parlous, violent, wild, forceful, tempestuous, tumultuous, agonizing, intolerable, stabbing, splitting, and pounding.

Synonyms Very difficult, hard, arduous, taxing, rigorous, onerous, burdensome, back-breaking, stiff, demanding, tough, formidable, exacting, punishing, gruelling, heavy, and uphill.

Synonyms Harsh, bitter, cold, freezing, arctic, Siberian, nasty, sharp, fierce, stringent, blistering, stinging, devastating, trenchant, biting, withering, unsparing, sound, excessive, inordinate, sky-high, punitive, penal, strict, inflexible, inexorable, rigid, relentless, unyielding, pitiless, draconian, repressive, tyrannical, iron-handed, inhuman, solid, hard, bitterly cold, bleak, icy, polar, extreme, scathing, strong, ferocious, savage, searing, scorching, mordant, caustic, cutting, rigorous, smart, extortionate, unreasonable, outrageous, stiff, punishing, swingeing, stern, uncompromising, implacable, unbending, unrelenting, merciless, ruthless, oppressive, rough, iron-fisted, brutal, and cruel.

Synonyms Stern, grim, forbidding, tight-lipped, unfriendly, grave, serious, stiff, stony, glowering, cold, frosty, frigid, dour, grim-faced, disapproving, unsmiling, sombre, sober, austere, flinty, steely, frowning, aloof, and icy.

Synonyms Plain, restrained, undecorated, unornamented, chaste, stark, unfussy, spartan, monastic, functional, uncluttered, simple, unadorned, unembellished, austere, spare, ultra-plain, without frills, ascetic, puritanical, clinical, and classic.