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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.
Full Definition of WORM. intransitive verb. : to move or proceed sinuously or insidiously. transitive verb. 1. b: to insinuate or introduce (oneself) by devious or subtle means c: to cause to move or proceed in or as if in the manner of a worm. 2.