deadliest
Maximally capable of killing
Deadliest is the superlative of deadly—the most lethal or fatal among a group.
It typically modifies nouns denoting threats: the deadliest snake in Australia, the deadliest war in human history, the deadliest pandemic since 1918.
The word emphasizes extreme danger or high death tolls.
Causing death or ruin
- mortalSubject to death
- killerOne who causes death
- murderousInclined to kill
- life-threateningRisking death
terminal · killing · slayer · destroyer · annihilating · devastating · massacre · carnage
Global disease outbreak
- epidemicWidespread disease occurrence
- plagueDeadly epidemic disease
- outbreakSudden eruption of trouble
- contagiousTransmissible between people
infectious · pathogen · disease · superbug · mutation · transmission · spread · virus
Unpreyed-upon dominant hunter
- venomousProducing injected toxins
- fangsSharp piercing teeth
- venomInjected animal poison
- strikeForceful impact or stoppage
ambush · cobra · mamba · box jellyfish · stonefish · crocodile · shark · scorpion
Showing no clemency
- pitilessLacking any compassion
- cold-bloodedUnfeeling or externally heated
- remorselessLacking guilt or pity
- unsparingShowing no leniency
relentless · brutal · savage · vicious · ferocious · bloodthirsty · cutthroat · assassin
Capable of causing harm
- venomousProducing injected toxins
- poisonousCapable of causing death
- radioactiveEmitting nuclear decay particles
- carcinogenicCauses cancer
contaminated · biohazard · asbestos · chemical · corrosive · noxious · pollutant · pathogenic
fatal
Causing death or ruin
life-threatening · terminal · killing · slayer · destroyer · annihilating · devastating · massacre · carnage · bloodiest
pandemic
Global disease outbreak
- epidemicWidespread disease occurrence
- plagueDeadly epidemic disease
- outbreakSudden eruption of trouble
contagious · infectious · pathogen · disease · superbug · mutation · transmission · spread · virus · bacteria
apex predator
Unpreyed-upon dominant hunter
strike · ambush · cobra · mamba · box jellyfish · stonefish · crocodile · shark · scorpion · cone snail
merciless
Showing no clemency
- pitilessLacking any compassion
- cold-bloodedUnfeeling or externally heated
- remorselessLacking guilt or pity
unsparing · relentless · brutal · savage · vicious · ferocious · bloodthirsty · cutthroat · assassin · executioner
toxic
Capable of causing harm
- venomousProducing injected toxins
- poisonousCapable of causing death
- radioactiveEmitting nuclear decay particles
carcinogenic · contaminated · biohazard · asbestos · chemical · corrosive · noxious · pollutant · pathogenic · pesticide
deadliestsafest
Least likely to cause harm
mildest · gentlest · tamest · healthiest