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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.
adventitious - associated by chance and not an integral part; poetry is something to which words are the accidental, not by any means the essential form- Frederick W. Robertson; they had to decide whether his misconduct was adventitious or the result of a flaw in his character.