fatal

adjective

fa·​tal ˈfā-tᵊl 

1

a

: causing death

a fatal crash

a fatal disease

a fatal wound

b

: bringing ruin

a fatal attraction to gambling

c

: causing failure

a fatal design flaw

Lack of sufficient support was fatal to his campaign.

2

a

: determining one's fate

the fatal flaw in this dazzling woman: a total lack of taste

—Marya Mannes

b

: of or relating to fate

… this science sets a fatal necessity on things …

—H. O. Taylor

c

: resembling fate in proceeding according to a fixed sequence

3

: fateful

a fatal hour

4

obsolete : fated

Synonyms

• calamitous
• cataclysmal
• cataclysmic
• catastrophic
• damning
• destructive
• disastrous
• fateful
• ruinous
• unfortunate

Choose the Right Synonym for fatal

deadly, mortal, fatal, lethal mean causing or capable of causing death.

deadly applies to an established or very likely cause of death.

a deadly disease

mortal implies that death has occurred or is inevitable.

a mortal wound

fatal stresses the inevitability of what has in fact resulted in death or destruction.

fatal consequences

lethal applies to something that is bound to cause death or exists for the destruction of life.

lethal gas

Examples of fatal in a Sentence

a disease that is often fatal

a chemical that can be fatal to birds

She made a fatal mistake.

Recent Examples on the Web

This week’s fatal shooting of UnitedHealthcare Chief Executive Brian Thompson has unleashed a wave of public feeling — exasperation, anger, resentment, helplessness — from Americans sharing personal stories of interactions with insurance companies, often seen as faceless corporate giants. —Tom Murphy and Devi Shastri, Los Angeles Times, 7 Dec. 2024

According to Kenny, the gunman was finally seen entering a cab that dropped him off near the George Washington Bridge Bus Terminal at 178th St and Broadway — his last known location — around 7:30 a.m., just 45 minutes after the fatal shooting. —Thomas Tracy, New York Daily News, 7 Dec. 2024

Justices on Thursday unanimously rejected the argument by Richard Barry Randolph, who was sentenced to death in the fatal beating and stabbing of Minnie Ruth McCollum, a manager of a Handy-Way store in Palatka. —News Service Of Florida, Orlando Sentinel, 6 Dec. 2024

This bacterium can cause listeriosis, a severe and sometimes fatal illness, especially dangerous for pregnant individuals, newborns, the elderly, and those with weakened immune systems. —Daniel R. Depetris, Newsweek, 6 Dec. 2024

Word History

Etymology

Middle English, from Latin fatalis, from fatum fate

First Known Use

14th century, in the meaning defined at sense 4

Phrases Containing fatal

• dealt a fatal blow

Kids Definition

fatal

adjective

fa·​tal ˈfāt-ᵊl 

1

: deciding one's fate : fateful

on that fatal day

2

: causing death or ruin

a fatal accident

fatally

-ᵊl-ē

adverb

Medical Definition

fatal

adjective

fa·​tal ˈfāt-ᵊl 

: causing death

a fatal diabetic coma

—Havelock Ellis

fatally

ˈfāt-ᵊl-ē 

adverb

Legal Definition

fatal

adjective

fa·​tal

1

: causing failure of a legal claim or cause of action

a fatal defect in the proceedings

—W. R. LaFave and J. H. Israel

2

: making something (as a contract) invalid or unenforceable

there is a fatal indefiniteness with the result that the agreement is void

—J. D. Calamari and J. M. Perillo

fatally adverb