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Word

fatal

adjective C1
/ˈfeɪ.təl/

Meanings

adjective

Causing death; resulting in death.

fatal: Causing death; resulting in death.
adjective

Causing complete failure or a very serious negative outcome; decisive in a bad way.

fatal: Causing complete failure or a very serious negative outcome; decisive in a bad way.

Definition

Causing death or leading to failure in a way that cannot be avoided.

Fatal describes something that causes death or results in a death. It can also refer to a mistake or weakness that leads to complete failure or a very serious negative outcome. In both uses, it suggests an effect that is decisive and irreversible. The word is often used in formal reporting and careful writing.

Examples

  • The investigators concluded that a fatal injury occurred within minutes of the impact.
  • I realized too late that my fatal assumption was that everyone had the same data.
  • She feared a fatal delay if the team kept revising the plan instead of acting.
  • They described the design flaw as fatal to the entire project’s safety case.

Common mistake

Learners sometimes use "fatal" to mean merely "very bad" (e.g., "a fatal movie"), but it usually means death-related or decisively ruinous.