insidious

insidious

CEFR: C1-C2 /in-sid-i-ous/ [ih2.n.s.ih1.d.iy2.ah0.s]

Definition: Proceeding in a gradual, subtle way, but with harmful effectsExample senences:

Example Sentences:
The obstruction and harassment is subtle but insidious and seriously affects the ability of the aid agencies to do their job.
Sexually transmitted diseases can be insidious and sometimes without symptoms