(1):
(superl.) Rigidly methodical, or adherent to rule or principle; exactly conformed to a standard; not allowing or employing unneccessary ornament, amplification, etc.; strict; - said of style, argument, etc.
(2):
(superl.) Very strict in judgment, discipline, or government; harsh; not mild or indulgent; rigorous; as, severe criticism; severe punishment.
(3):
(superl.) Serious in feeeling or manner; sedate; grave; austere; not light, lively, or cheerful.
(4):
(superl.) Difficult to be endured; exact; critical; rigorous; as, a severe test.
(5):
(superl.) Sharp; afflictive; distressing; violent; extreme; as, severe pain, anguish, fortune; severe cold.