Others, more quietly but just as insidiously, operate from the Muslim religious right.
It has been insidiously planted in some parts where the discontent growing out of unemployment brought fertile opportunity.
It looked, somehow, as if it were insidiously leading the way to an appeal for money.
Something fresh had come into his life, noiselessly, insidiously, without effort.
And thus a dead point in the revolution of my affairs was insidiously got over.
"Better in health, because better in spirits," said the housekeeper, insidiously.
Slowly and insidiously it had come to dominate every other problem.
This harrowing picture has the modicum of truth that makes it insidiously dangerous.
And now it was as if subtly, insidiously, her relation to him had become inverted.
Are you insidiously advised or tempted to contract it, by any one?
insidious in·sid·i·ous (ĭn-sĭd'ē-əs)
Being a disease that progresses with few or no symptoms to indicate its gravity.