perniciously
per-ni-cious-ly
adverb
In a way that causes great harm or destruction, often gradually.
"The invasive species spread perniciously, damaging local ecosystems."
Thesaurus
Synonyms: insidiously, banefully
per-ni-cious-ly
In a way that causes great harm or destruction, often gradually.
"The invasive species spread perniciously, damaging local ecosystems."
Synonyms: insidiously, banefully