severe (adj)
Sens 1 : absolute or rigorous in restraint, punishment, or requirement:
inflexible, stringent, restrictive. [source : MWU]
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Sens 2 : of a great degree or an undesirable or harmful extent. [source : MWU]
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Sens 3 : strict or harsh in attitude or treatment imposing stern discipline. [source : OAL]
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Sens 4 : very bad, intense, difficult, etc. [source : OAL]
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Sens 5 : demanding great ability, skill, or resilience. [source : OD]
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Sens 6 : easily hurt or damaged. [source : OAL]