severe

adj

1.
intensely or extremely bad or unpleasant in degree or quality
terrible wicked
Derived from:
severeness severity
2.
very strong or vigorous
hard knockout
Derived from:
severeness
3.
severely simple
austere stark stern
Derived from:
severeness
4.
unsparing and uncompromising in discipline or judgment
spartan
Derived from:
severeness severity
5.
causing fear or anxiety by threatening great harm
dangerous grave grievous life-threatening serious
Derived from:
severeness
6.
very bad in degree or extent
Derived from:
severeness severity