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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.
â¢ RUINOUS (adjective) The adjective RUINOUS has 2 senses: 1. extremely harmful; bringing physical or financial ruin. 2. causing injury or blight; especially affecting with sudden violence or plague or ruin. Familiarity information: RUINOUS used as an adjective is rare.