Lethal
Lethal means capable of causing death — or, figuratively, capable of being completely devastating. Learn how to use this strong word in context with examples and a memory trick.
Simple meaning
Lethal means capable of causing death — or, in a broader sense, capable of being completely devastating or destructive.
Detailed meaning
Lethal comes from the Latin lethalis — relating to death (letum = death).
Literal use: Something physically capable of killing. "A lethal dose of the medication."
Figurative use: Something devastatingly effective — able to destroy, defeat, or end something completely. "Her cross-court shot was lethal." (In sport — impossible to return.) "The combination of poor timing and bad press was lethal for the campaign."
The figurative use is very common, especially in sports commentary, business analysis, and drama.
Where to use it
It works well in:
- Medical and safety contexts — "A lethal dose", "lethal injection"
- Sports and competition — "a lethal finisher", "lethal accuracy"
- Business and strategy — "The price war was lethal for smaller competitors."
Where not to use it
Lethal is a strong word. Don't use it casually for things that are merely unpleasant.
5 example sentences
- The combination of speed and precision made her a lethal competitor — she rarely lost a point when serving.
- The report identified three lethal risks in the manufacturing process that required immediate action.
- Overconfidence can be lethal in negotiations — it closes your ears to information you need.
- The drug is effective in small doses but lethal at higher concentrations.
- Their partnership was lethal in the market — one led the product, the other led the sales, and nothing could compete.
Similar & opposite words
Similar (synonyms)
Opposite (antonyms)
Shade of difference: Fatal describes something that has already caused death. Lethal describes something capable of causing death — it hasn't necessarily happened yet. Deadly is the most informal and common of the three. Mortal is formal and often poetic.
Memory trick
Summary
Lethal means capable of causing death — or, figuratively, completely devastating. It is a strong word that earns its place in serious, high-stakes contexts. In sport, business, and strategy, it describes something so effective it leaves no room for recovery.
In your next piece of writing, consider whether devastating or deadly might be better replaced by lethal — particularly when you want to signal that something is not just harmful, but comprehensively destructive.
Next word — Loathe. Or, jump to today's kural.