perniciously

1. But youth unemployment is rising perniciously across much of the developed world.
   但是青年失业问题在许多发达国家之间都在逐渐恶化。

adv

1. in a noxiously baneful way
   1. this banefully poisoned climate

   Synonym:    banefully

2. in a harmfully insidious manner
   1. these drugs act insidiously

   Synonym:    insidiously