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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.
3. a rapid development, spread, or growth of something, esp something unpleasant: an epidemic of strikes. [C17: from French epidemique, Ã©pidÃ©mique Via Late latin From greek epidÄmia: literally among the, people from- + epi dÄmos]. people