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lethal

lethal

52 4.1
Extremely effective and powerful, causing an opponent to lose
  • adjective
  • /ˈliːθəl/
  • Informal
translation icon : demoledor
  • As commander in chief, I will ensure America always has the strongest, most lethal fighting force in the world.

Now I'm going to go in with this lethal purpley shade.

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Examples

  • The team's strategy was lethal, ensuring they dominated the game from start to finish.

  • To be this lethal energy, you have to be right in mind and spirit.

  • So young and yet so lethal.

  • You are the most lethal warrior on the planet.

    Academic text (2011)
  • I often say that poverty is the most lethal weapon of mass destruction.

  • As they learn from their predecessors' mistakes, these new leaders may become even more lethal.

    Academic text (2007)
  • The educational pathways available to Americans can be, and often are, lethal to the cherished dreams of our culture.

    Academic text (1992)
  • If you don't, it sets up a caste system, and that caste system is lethal to democracy.

  • Her performance in the competition was lethal, leaving no doubt about her skill.

  • With a lethal combination of speed and precision, the athlete broke the previous record.

Synonyms

devastating
vslethal
224 5.1

Causing very great damage or sadness

is informal and means an extreme decisive nonliteral defeat
deadly
vslethal
2 3.9

To a very high degree

focuses on powerful effect and decisive damage rather than sole intensity

Antonyms

138 3.6

Unable to do or stop something because you have no control

90 3.4

Not working well enough to give the wanted result

Compounds

lethal dose
  • Specialized
14 6.7

An amount of a substance that is enough to cause death

lethal agent
  • Specialized
1 7.7

A poison or gas that can kill people

lethal gene
  • Specialized
7.6

A gene that causes the death of an animal or plant that has it

How Effective

lethal
  • Informal
52 4.1
devastating
224 5.1
potent
119 5.5
powerful
1.7
effective
986 3.1

Surface Forms

lethal positive
lethaler comparative
lethalest superlative

Morphology

lethal = leth + al

The figurative sense ('extremely effective') is a semantic extension of the basic 'deadly' meaning, but the morphological root 'leth' is not a recognizable English base, so the form-to-meaning mapping is only partially helpful to learners.

Etymology

Lethal comes from the Latin word letum, meaning 'death', and a helpful way to remember the figurative use is to think 'deadly effective'. So when something is very powerful or ends an opponent quickly, we call it lethal even if it does not kill.