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âº (of something unpleasant or dangerous) gradually and secretly causing harm: High blood pressure is an insidious condition which has few symptoms. Thesaurus: synonyms and related words. Dangerous and harmful. adverse.
Definition of sick. 1  1a (1) : affected with disease or ill health : ailing (2) : of, relating to, or intended for use in sickness took five sick days this month a sick wardb : queasy, nauseated sick to one's stomach was sick in the carc : undergoing menstruation. 2  2 : spiritually or morally unsound or corrupt.