Adverb
in a harmfully insidious manner
Source: WordNetthese drugs act insidiously Source: Internet
Abuse has crept so insidiously into our society, our communities, in this country. Source: Internet
Canada is now governed by a junta sitting at London, known as “The Round Table”, with ramifications in Toronto, in Winnipeg, in Victoria, with Tories and Grits receiving their ideas from London and insidiously forcing them on their respective parties. Source: Internet
Most insidiously, many garden center plants have been grown using systemic pesticides or neonicotinoids, water soluble chemicals that kill or harm pollinators. Source: Internet
Drinking with newspapermen, and I think with a lot of other people, too, is often done and most insidiously after work as a kind of reward. Source: Internet
Reasons for reoperation include persistent bleeding after surgery, development of or persistence of infection or, more insidiously, retained foreign objects. Source: Internet