insidiously
Adverb
Meaning
in a harmfully insidious manner
Source: WordNetSynonyms
Antonyms
Examples
these drugs act insidiously
Abuse has crept so insidiously into our society, our communities, in this country.
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.
Most insidiously, many garden center plants have been grown using systemic pesticides or neonicotinoids, water soluble chemicals that kill or harm pollinators.
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.
Reasons for reoperation include persistent bleeding after surgery, development of or persistence of infection or, more insidiously, retained foreign objects.