1. (adj) severe, terrible, wicked
intensely or extremely bad or unpleasant in degree or quality
Synonyms: life-threatening, dreadful, distasteful, revolting, pixilated, repellant, foul, implike, repellent, mischievous, arch, austere, serious, awful, puckish, frightful, horrendous, severe, sinful, tremendous, disgustful, dire, loathly, stern, grievous, skanky, repelling, atrocious, painful, prankish, impish, grave, dangerous, yucky, wicked, unholy, dread(a), hard, unspeakable, horrific, terrible, dreaded, abominable, frightening, fearsome, fearful, loathsome, direful, stark, disgusting, spartan, knockout
Antonyms: noncritical, fancy, mild, weak, indulgent, noncrucial, good
2. (adj) hard, knockout, severe
very strong or vigorous
Synonyms: severe, arduous, wicked, grueling, tough, grievous, serious, terrible, toilsome, hard, stark, life-threatening, spartan, stern, heavy, voiceless, laborious, difficult, grave, austere, knockout, gruelling, intemperate, concentrated, punishing, unvoiced, dangerous, operose, backbreaking, surd, strong
Antonyms: noncritical, indulgent, fancy, weak, mild, noncrucial, good
3. (adj) austere, severe, stark, stern
severely simple
Synonyms: life-threatening, perfect(a), consummate(a), unadulterated, double-dyed(a), austere, serious, ascetic, bare, arrant(a), stark, severe, desolate, staring(a), unrelenting, stern, grievous, sodding(a), unappeasable, grave, everlasting(a), crude(a), dangerous, wicked, complete(a), hard, gross(a), terrible, stark(a), pure(a), relentless, barren, unforgiving, blunt, grim, bleak, inexorable, exacting, thoroughgoing(a), strict, ascetical, utter(a), spartan, knockout
Antonyms: noncrucial, noncritical, indulgent, good, mild, fancy, weak
4. (adj) severe, spartan
unsparing and uncompromising in discipline or judgment
Synonyms: serious, stark, spartan, ascetical, severe, grave, knockout, austere, terrible, wicked, hard, life-threatening, stern, ascetic, dangerous, grievous
Antonyms: noncrucial, noncritical, mild, fancy, indulgent, good, weak
5. (adj) dangerous, grave, grievous, serious, severe, life-threatening
causing fear or anxiety by threatening great harm
Synonyms: severe, sober, serious, wicked, stark, unsafe, terrible, hard, spartan, stern, heavy, unplayful, weighty, monstrous, grave, good, grievous, atrocious, sedate, flagitious, life-threatening, dangerous, knockout, austere, heartbreaking, heartrending, solemn
Antonyms: indulgent, fancy, weak, mild, good, noncrucial, noncritical
6. (adj) severe
very bad in degree or extent
Synonyms: serious, stark, spartan, grave, knockout, austere, terrible, wicked, hard, life-threatening, stern, dangerous, grievous
Antonyms: noncritical, indulgent, mild, weak, noncrucial, good, fancy
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Synonyms for severe 
