Cancer is the most pernicious, insidious, disgusting disease of life.
It is subtle, insidious, and never more dangerous than when women passionately deny that they themselves are engaging in it.
To promote the insidious—“rape is hilarious”—is to join the crime at its own filthy level.
Many in the media serve as enablers with subtle but insidious belittling of conservatives.
But while insidious shares themes with Paranormal Activity, the resemblance ends there.
The last and supreme lie in Bethmann-Hollweg's speech is the most insidious of all.
Persuasive is the voice of Vice, That spreads the insidious snare.
The insidious bite of the current was getting horribly on his nerves.
The strong man must at all times be alert to the attack of insidious disease.
With the eye of a botanist she viewed the flowers—most potent weapons of insidious May.
insidious in·sid·i·ous (ĭn-sĭd'ē-əs)
Being a disease that progresses with few or no symptoms to indicate its gravity.