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Synset

working or spreading in a hidden and usually injurious way
<adj.all>

insidious more info
pernicious more info
subtle more info

sample sentences

"glaucoma is an insidious disease"
"a subtle poison"
lexical pointers
derivationally related form
insidiousness
lexical pointers
derivationally related form
perniciousness
semantic pointers
similar to
harmful