only 1 use
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Definition
not appearing dangerous, but actually very harmful over time
or:
treacherous (dangerous due to trickery or from hidden or unpredictable risks)
or:
treacherous (dangerous due to trickery or from hidden or unpredictable risks)
- Henry Jekyll stood at times aghast before the acts of Edward Hyde; but the situation was apart from ordinary laws, and insidiously relaxed the grasp of conscience.p. 91.8
insidiously = in a dangerous, tricky manner
There are no more uses of "insidious" in Dr. Jekyll and Mr. Hyde.
Typical Usage
(best examples)