Severe, a. [Compar. Severer; superl. Severest.]
Etymology: [L. severus; perhaps akin to Gr. swikns innocent, chaste: cf. F. sévère. Cf. Asseverate, Persevere.]
1. Serious in feeeling or manner; sedate; grave; austere; not light, lively, or cheerful. Your looks alter, as your subject does, From kind to fierce, from wanton to severe. Waller.
2. Very strict in judgment, discipline, or government; harsh; not mild or indulgent; rigorous; as, severe criticism; severe punishment. "Custody severe." Milton. Come! you are too severe a moraler. Shak. Let your zeal, if it must be expressed in anger, be always more severe against thyself than against others. Jer. Taylor.
3. 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. "Restrained by reason and severe principles." Jer. Taylor. The Latin, a most severe and compendious language. Dryden.
4. Sharp; afflictive; distressing; violent; extreme; as, severe pain, anguish, fortune; severe cold.
2 more senses
5. Difficult to be endured; exact; critical; rigorous; as, a severe test.
Syn. -- Strict; grave; austere; stern; morose; rigid; exact; rigorous; hard; rough; harsh; censorious; tart; acrimonious; sarcastic; satirical; cutting; biting; keen; bitter; cruel. See Strict. -- Se*vere"ly, adv. -- Se*vere"ness, n.
Shades of meaning
That is severe which is devoid of all softness, mildness, tenderness, indulgence or levity, or (in literature and art) devoid of unnecessary ornament, amplification, or embellishment of any kind; as, a severe style; as said of anything painful, severe signifies such as heavily taxes endurance or resisting power; as, a severe pain, fever, or winter. Rigid signifies primarily stiff, resisting any effort to change its shape; a corpse is said to be rigid in death; hence, in metaphorical sense, a rigid person or character is one that resists all efforts to change the will or course of conduct; a rigid rule or statement is one that admits of no deviation. Rigorous is nearly akin to rigid, but is a stronger word, having reference to action or active qualities, as rigid does to state or character; a rigid rule may be rigorously enforced. Strict (L. stringo, bind) signifies bound or stretched tight, tense, strenuously exact. Stern unites harshness and authority with strictness or severity; stern, as said even of inanimate objects, suggests something authoritative or forbidding. Austere signifies severely simple or temperate, strict in self-restraint or discipline, and similarly unrelenting toward others. We speak of austere morality, rigid rules, rigorous discipline, stern commands, severe punishment, harsh speech or a harsh voice, hard requirements, strict injunctions, and strict obedience. Strict discipline holds one exactly and unflinchingly to the rule; rigorous discipline punishes severely any infraction of it. The austere character is seldom lovely, but it is always strong and may be grand, commanding, and estimable.