insidious

More insidious groupthink has taken hold inside the NFL: only quarterbacks can win the league’s Most Valuable Player award.

Hatred of minorities: Fascism lacks a rationale and focus for its followers’ emotional intensity without an insidious internal enemy.

But an equally insidious carbon tax has been quietly advancing in county courthouses across the U.S. in the form of climate lawfare targeted almost exclusively at American industry.

On Saturday, Scotland Yard said group-based offending was "particularly insidious and devastating in its profound impact on the children affected".

One of the most "insidious" problems, Natalie said, was as the pain increased, ketamine became one of the only ways of numbing it - causing further damage.