insidiously

Less often examined is the mechanics of “Star Wars” as a brand with emotional staying power and Gen X’s insidiously possessive attitude concerning the original trilogy.

He described “The Seed of the Sacred Fig” as about “how insidiously the Iranian dictatorship creeps into families.”

Philip Landrigan, a public health physician and professor of epidemiology at Boston College, told Grist that the crisis has “quietly and insidiously gotten worse while all attention has been focused on the climate.”

Oncogenes are also insidiously adept at generating tumors that over time become genetically "independent" from their origin, so it has been exceedingly difficult for scientists to shut down their replication at the source.

However, other online commenters have pointed out that these memes — and Mills’ online rant — perpetuate some insidiously homophobic rhetoric, namely the idea that it is more shameful to be gay than to be an abuser.