insidious

harmful or damaging but acting slowly and in a way that is not immediately obvious

peligroso pero sutil, insidioso

• an insidious disease/condition

Collocations insidious effects · insidious influence

• The insidious effects of smoking are well documented.

  Los efectos insidiosos del tabaco están bien documentados.

intended to trick or deceive someone in a clever and subtle way

engañoso, astuto y sutil

• an insidious plan/plot

Collocations insidious motives · insidious intentions

• The politician's insidious plans were revealed in the press.

  Los planes insidiosos del político fueron revelados en la prensa.