severe

adj.

[1]	strict , terrible , wicked , harsh , rigorous , austere , hard , stony , stony-hearted , hard-hearted , flinty , inexorable , iron-handed , oppressive , unbending , rigid , uncompromising , relentless , unyielding , obdurate , pitiless , punitive , merciless , unsympathetic , unfeeling , cruel , brutal , mean , savage , inhuman , beastly , ruthless , despotic , dictatorial , tyrannical , autocratic , demanding , exacting , painstaking , fastidious , exigent , taxing
[2]	stern , hard , knockout , forbidding , dour , glowering , grave , grim , stiff , strait-laced , serious , unsmiling , sober , cold , frigid , aloof , austere
[3]	dangerous , austere , stark , critical , dreadful , stern , awful , life-threatening , acute , dire , mortal , fatal , terminal
[4]	stringent , spartan , punitive , harsh , punishing , burdensome , tough , onerous , grievous , painful , Draconian/Draconic
[5]	harsh , dangerous , grave , bitter , cold , grievous , serious , inclement , keen , life-threatening , violent , stormy , intense , turbulent , fierce , wicked
[6]	stark , bare , plain , austere , Spartan , ascetic , primitive , simple , sparse , spare , monastic , modest , unadorned , unembellished , crude , undecorated , unembroidered