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- DictionaryIn·sid·i·ous/inˈsidēəs/
adjective
- 1. proceeding in a gradual, subtle way, but with harmful effects: "sexually transmitted diseases can be insidious and sometimes without symptoms"
1. a. : having a gradual and cumulative effect : subtle. the insidious pressures of modern life. b. of a disease : developing so gradually as to be well established before becoming apparent. 2. a. : awaiting a chance to entrap : treacherous. b. : harmful but enticing : seductive. insidious drugs. insidiously adverb. insidiousness noun.
(of something unpleasant or dangerous) gradually and secretly causing harm: High blood pressure is an insidious condition which has few symptoms. SMART Vocabulary: related words and phrases. Dangerous and harmful. adverse conditions. adverse effect. adverse publicity. adverse reaction. deleteriously. destabilizing. destructively. destructiveness.
adjective. intended to entrap or beguile: an insidious plan. stealthily treacherous or deceitful: an insidious enemy. Synonyms: crafty, subtle, wily, cunning, artful. operating or proceeding in an inconspicuous or seemingly harmless way but actually with grave effect: an insidious disease. insidious. / ɪnˈsɪdɪəs / adjective.
(of something unpleasant or dangerous) gradually and secretly causing harm: High blood pressure is an insidious condition which has few symptoms. SMART Vocabulary: related words and phrases. Dangerous and harmful. adverse conditions. adverse effect. adverse publicity. adverse reaction. deleteriously. destabilizing. destructively. destructiveness.
working or spreading in a hidden and usually injurious way. “glaucoma is an insidious disease” synonyms: pernicious, subtle. harmful. causing or capable of causing harm. adjective. intended to entrap. synonyms: dangerous, unsafe. involving or causing danger or risk; liable to hurt or harm. adjective. beguiling but harmful. “ insidious pleasures”
See insidious in the Oxford Advanced American Dictionary. Check pronunciation: insidious. Definition of insidious adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
5 days ago · insidious in British English. (ɪnˈsɪdɪəs ) adjective. 1. stealthy, subtle, cunning, or treacherous. 2. working in a subtle or apparently innocuous way, but nevertheless deadly. an insidious illness. Collins English Dictionary.
