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Definition of Insidiously
1. Adverb. In a harmfully insidious manner. "These drugs act insidiously"
Definition of Insidiously
1. Adverb. in an insidious manner ¹
¹ Source: wiktionary.com
Definition of Insidiously
1. [adv]
Medical Definition of Insidiously
1. Having a imperceptible commencement, as of a disease with a late manifestation of definite symptoms. (27 Sep 1997)