Antonym: health. Similar words: homesickness, darkness, nickname, sick, tactlessness, sicken, sadness, madness. Meaning: ['sɪknɪs] 
n. 1. impairment of normal physiological function affecting part or all of an organism 2. defectiveness or unsoundness 3. the state that precedes vomiting.
n. 1. impairment of normal physiological function affecting part or all of an organism 2. defectiveness or unsoundness 3. the state that precedes vomiting. 
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(1) Study sickness while you are well. 
(2) Sickness shows us what we are.
(3) Sickness is felt, but health not at all.
(4) By the side of sickness health becomes sweet.
(5) Health is not valued till sickness comes. Thomas Fuller
(6) In sickness health is known.
(7) Sickness is everyman's master.
(8) Is there much sickness in the village now?
(9) Liam had suffered violent sickness and diarrhoea.
(10) I was afraid the sickness had sapped my strength.
(11) They were disabled by age or sickness.
(12) A headache usually denotes sickness.
(13) She's been off work because of sickness.
(14) When he returned, he noticed their sickness and prepared an antidote.
(15) The sickness spread rapidly.
(16) Several workers complained of feelings of sickness and headaches. Sentencedict.com
(17) Don't hide your sickness for fear of treatment.
(18) Sickness may develop from inadequate fluid intake.
(19) They were absent because of sickness.
(20) Sickness has fastened on him.
(21) We feel great anxiety about the general engineer's sickness.
(22) Cows can give sickness to human beings.
(23) The sickness rose inside him.
(24) We strongly recommend insuring against sickness or injury.
(25) Sickness often results from eating too much.
(26) Many women experience sickness during pregnancy .
(27) She tried to thrust back the little stabs of home - sickness.
(28) In fifty-two years of working he had one week of sickness.
(29) Stress is often a factor in the development of long-term sickness.
(30) The Personnel Department keeps a record of employees absent through sickness.
More similar words: homesickness, darkness, nickname, sick, tactlessness, sicken, sadness, madness, shyness, fitness, harness, witness, finesse, kindness, business, awareness, wellness, eagerness, dizziness, surliness, aloofness, greatness, toughness, obtuseness, brashness, gentleness, wilderness, stinginess, on business, inessential.