fatal
/ˈfeɪtəl/
adjective
- Causing death or ending in death.
- Doctors warned that the disease could be fatal if not treated.
- The driver suffered a fatal injury in the crash.
- A fatal mistake by the pilot led to the plane's destruction.
- Causing disaster or complete failure; very harmful.
- A fatal flaw in the plan was that no one had checked the weather.
- One fatal error in the code caused the entire system to crash.
- The team's lack of preparation proved fatal to their chances of winning.