Synonyms for sick

modified

sick and ill both express the idea of being in bad health, affected with disease, etc., but sick is more commonly used than ill, which is somewhat formal he's a sick person; he is sick, or ill, with the flu; in British usage sick generally means affected with nausea; ailing usually suggests prolonged or even chronic poor health she has been ailing ever since her operation; indisposed suggests a slight, temporary illness or feeling of physical discomfort indisposed with a headache