INSIDIOUS in THE SUNLIGHT DIALOGUES

5 uses

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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)

Not just because it made you fat, made your heart work harder than an old heart should, but bad in ways more insidious—the same as buying without shopping first for a reasonable bargain, or buying what you didn't need, or not buying at all, on the other hand, because your mind was too much on the column of numbers written under "Deposits" in your bank book.
1 — The Watchdog (21% in)
She could make a laughingstock of him, turn all his sober arguments to the jabbering of a monkey; her very appearance made him clownlike, bumpkinish; and yet his wordless righteousness, more insidious than anything in the play—a righteousness without rational foundation, indefensible and therefore mute—made a gaudy whore of her.
12 — A Mother's Love (49% in)
It was as if Boyle were taking his body and brain away from him, creeping up insidiously inside.
17 — Benson versus Boyle (47% in)
I can offer no reason under the sun why you should capitulate to my insidious suggestion.
18 — The Dragon's Dwelling-Place and the Court for Owls (89% in)

There are no more uses of "insidious" in The Sunlight Dialogues.

Typical Usage (best examples)

insidious used in The Sunlight Dialogues