Synonyms of fatal

fatal

adjective

ˈfā-tᵊl 

1

as in disastrous

bringing about ruin or misfortune

I made the fatal mistake of sharing my secret with the office's biggest blabbermouth

Synonyms & Similar Words

• disastrous
• catastrophic
• unfortunate
• cataclysmic
• destructive
• fateful
• ruinous
• calamitous
• damning
• damaging
• adverse
• apocalyptic
• harmful
• cataclysmal
• detrimental
• injurious
• pernicious
• deleterious
• apocalyptical
• luckless
• hapless
• baneful
• evil
• prejudicial
• ill-fated
• hurtful
• ill-starred
• noxious
• ill
• baleful

Antonyms & Near Antonyms

• fortuitous
• lucky
• fortunate
• happy
• providential
• fluky
• fair
• promising
• flukey
• golden
• optimistic
• propitious
• bright
• hopeful
• encouraging
• rosy
• auspicious
• heartening
• upbeat
• rose-colored

2

as in lethal

likely to cause or capable of causing death

that snake's venom is fatal unless the victim is given the antidote almost immediately

Synonyms & Similar Words

• lethal
• deadly
• poisonous
• infectious
• infective
• killer
• harmful
• terminal
• dangerous
• toxic
• deathly
• mortal
• murderous
• baleful
• injurious
• fell
• destructive
• hazardous
• pernicious
• vital
• deleterious
• pestilent
• serious
• baneful
• virulent
• risky
• perilous
• sublethal
• noxious
• pestilential
• threatening
• ugly
• bloody
• truculent
• grievous
• menacing
• sanguinary
• unhealthy
• grave
• parlous
• unsound
• jeopardizing
• sanguine
• internecine

Antonyms & Near Antonyms

• nonfatal
• healthy
• beneficial
• healthful
• nonlethal
• wholesome
• salutary
• corrective
• salubrious
• remedial
• restorative
• curative
• useful
• advantageous
• tonic
• safe
• nontoxic
• alleviative
• nonpoisonous

Synonym Chooser

How does the adjective fatal differ from other similar words?

Some common synonyms of fatal are deadly, lethal, and mortal. While all these words mean "causing or capable of causing death," fatal stresses the inevitability of what has in fact resulted in death or destruction.

fatal consequences

When is it sensible to use deadly instead of fatal?

While the synonyms deadly and fatal are close in meaning, deadly applies to an established or very likely cause of death.

a deadly disease

When would lethal be a good substitute for fatal?

The meanings of lethal and fatal largely overlap; however, lethal applies to something that is bound to cause death or exists for the destruction of life.

lethal gas

When might mortal be a better fit than fatal?

The synonyms mortal and fatal are sometimes interchangeable, but mortal implies that death has occurred or is inevitable.

a mortal wound

Example Sentences

Recent Examples of fatal

New evidence emerged, including confirmation from a witness who identified the suspect as the driver in the fatal crash and validation of toxicology results from the time of the crash, according to Menendez Abdala’s new arrest warrant. —Milena Malaver, Miami Herald, 3 Sep. 2025

According to the Royal Virgin Islands Police Force (RVIPF), emergency services were alerted to a fatal incident on Saturday. —Christina Dugan Ramirez, FOXNews.com, 3 Sep. 2025

After a near-fatal experience, Kaif began seeing both stories and silences differently. —Kaif Shaikh, Interesting Engineering, 3 Sep. 2025

Key Background Mangione, 27, was arrested in December following a days-long manhunt after the fatal shooting of UnitedHealth CEO Brian Thompson, and in April, he was indicted on four federal charges, including murder. —Conor Murray, Forbes.com, 3 Sep. 2025