Definition of Insidious
Insidious
in·sid·i·ous
Definition/Meaning
(adjective)
Proceeding in a subtle but harmful way, often secretly or gradually.
e.g. The insidious effects of pollution on the environment were only recently discovered.
(adjective)
having a subtle, gradual and cumulative effect;
e.g. The insidious stress of college academics has debilitating effects on students.
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