Fatal
Part of speech: adjective
Definition: Proceeding from, or appointed by, fate or destiny. Foreboding death or great disaster. Causing death or destruction.
Example sentence: Whether it is a tsunami, or whether it is a hurricane, whether it's an earthquake - when we see these great fatal and natural acts, men and women of every ethnic persuasion come together and they just want to help.
Decisive
Part of speech: adjective
Definition: Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive.Marked by promptness and decision.
Example sentence: Most of us aren't defeated in one decisive battle. We are defeated one tiny, seemingly insignificant surrender at a time that chips away at who we should really be.