pernicious
per ni shuhs
- s exceedingly harmful
- s working or spreading in a hidden and usually injurious way
- The movie has not been true to the book; the director has made some pernicious changes.
- The suicide is a pernicious story circulated by the police; this is cold-blooded murder.
- Inspite of medical advances, the most pernicious forms of cancer like pancreatic, lung and brain are still nearly invincible.