Sick describes someone who's not well, suffering from some kind of illness. You shouldn't go to school when you're sick.

If you're sick in bed, you're ill. While sick usually refers to people with physical or mental illnesses, it can also be used to describe an object or system that isn't working right, like a sick economy. Sick can also mean that you're tired of something, like a song you have heard too many times — you're sick of it. Sick is also slang used to describe something that is visually impressive, like a sick hockey goal.

Definitions of sick
  1. adjective
    affected by an impairment of normal physical or mental function
    synonyms: ill
    not in good physical or mental condition; out of condition
    not in or exhibiting good health in body or mind
    afflicted, stricken
    grievously affected especially by disease
    affected by ague
    ailing, indisposed, peaked, poorly, seedy, sickly, under the weather, unwell
    somewhat ill or prone to illness
    air sick, airsick, carsick, seasick
    experiencing motion sickness
    characteristic of or affected with autism
    bedfast, bedrid, bedridden, sick-abed
    confined to bed (by illness)
    bilious, liverish, livery
    suffering from or suggesting a liver disorder or gastric distress
    suffering from or prone to bronchitis
    afflicted with or associated with pulmonary tuberculosis
    convalescent, recovering
    returning to health after illness or debility
    delirious, hallucinating
    experiencing delirium
    suffering from diabetes
    dizzy, giddy, vertiginous, woozy
    having or causing a whirling sensation; liable to falling
    suffering from dyspepsia
    faint, light, light-headed, lightheaded, swooning
    weak and likely to lose consciousness
    feverish, feverous
    having or affected by a fever
    experiencing odd bodily sensations
    suffering from gout
    looking pale and unhealthy
    laid low, stricken
    put out of action (by illness)
    laid up
    ill and usually confined
    affected with or related to milk sickness
    nauseated, nauseous, queasy, sickish
    feeling nausea; feeling about to vomit
    affected with palsy or uncontrollable tremor
    paralytic, paralyzed
    affected with paralysis
    suffering complete paralysis of the lower half of the body usually resulting from damage to the spinal cord
    rachitic, rickety
    affected with, suffering from, or characteristic of rickets
    afflicted with scrofula
    inclined to sneeze
    suffering from spastic paralysis
    tubercular, tuberculous
    constituting or afflicted with or caused by tuberculosis or the tubercle bacillus
    not healed
    mildly physically distressed
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    in good health especially after having suffered illness or injury
    physically and mentally sound or healthy
    having or indicating good health in body or mind; free from infirmity or disease
    asymptomatic, symptomless
    having no symptoms of illness or disease
    cured, healed, recovered
    freed from illness or injury
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  2. adjective
    feeling nausea; feeling about to vomit
    synonyms: nauseated, nauseous, queasy, sickish
    affected by an impairment of normal physical or mental function
  3. adjective
    affected with madness or insanity
    synonyms: brainsick, crazy, demented, disturbed, mad, unbalanced, unhinged
    afflicted with or characteristic of mental derangement
  4. adjective
    having a strong distaste from surfeit
    sick of it all”
    sick to death of flattery”
    “gossip that makes one sick
    synonyms: disgusted, fed up, sick of, tired of
    not pleased; experiencing or manifesting displeasure
  5. adjective
    shockingly repellent; inspiring horror
    synonyms: ghastly, grim, grisly, gruesome, macabre
    frightening because of an awareness of danger
  6. adjective
    deeply affected by a strong feeling
    “sat completely still, sick with envy”
    “she was sick with longing”
    affected, moved, stirred, touched
    being excited or provoked to the expression of an emotion
  7. adjective
    (of light) lacking in intensity or brightness; dim or feeble
    synonyms: pale, pallid, wan
    wanting in physical strength
  8. noun
    people who are sick
    “they devote their lives to caring for the sick
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    type of:
    (plural) any group of human beings (men or women or children) collectively
  9. verb
    eject the contents of the stomach through the mouth
    synonyms: barf, be sick, chuck, disgorge, regurgitate, throw up, vomit, vomit up
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    keep down
    manage not to throw up
    type of:
    egest, eliminate, excrete, pass
    eliminate from the body
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