There’s a special, insidious kind of hatred for him.
He snapped orders and lost his patience before the smallest difficulty; when he lost his patience, he screamed at people: he had a vocabulary of insults that carried a caustic, insidious, almost feminine malice; his face was sullen.
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The debt grew insidiously—just a little at a time and always for a good purpose.
Alan Greenspan -- The Age of Turbulence
We’ve grown accustomed to spending more than we earn, but the increasing debt is an insidious problem.