insidious
adjective
in·sid·i·ous
in-ˈsi-dē-əs
1
a
: having a gradual and cumulative effect : subtle
the insidious pressures of modern life
b
of a disease
: developing so gradually as to be well established before becoming apparent
2
a
: awaiting a chance to entrap : treacherous
b
: harmful but enticing : seductive
insidious drugs
insidiously
adverb
insidiousness
noun
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Merriam-Webster unabridged
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