Definition of lethal in English:

lethal

Syllabification: le·thal
Pronunciation: /ˈlēTHəl
 
/

adjective

1Sufficient to cause death: a lethal cocktail of alcohol and pills
More example sentences
  • In sufficient quantities its spores can be lethal to humans.
  • Grey squirrels have out-competed reds for food and also carry squirrel-pox virus which is lethal to the native animals.
  • The gas acts like mustard gas, and can prove lethal to those with respiratory problems.
1.1Harmful or destructive: the Krakatoa eruption was the most lethal on record
More example sentences
  • Friday was a bizarre affair, fuelled by a lethal combination of beer, wine, Jack Daniels and vodka.
  • The cider and vodka combination is far too lethal for my poor liver so I ended up puking.
  • Entire governments, never mind single ministers, have been toppled by that lethal combination.
Synonyms
dangerous, destructive, harmful, pernicious
literary deathly, nocuous

Origin

late 16th century (in the sense 'causing spiritual death'): from Latin lethalis, from lethum, a variant (influenced by Greek lēthē 'forgetfulness') of letum 'death'.

Derivatives

lethality

Pronunciation: /lēˈTHalətē/
noun
More example sentences
  • The recent trend is an increase in the lethality of small groups.
  • Items like flash hiders, pistol grips, bayonet lugs and folding stocks do not enhance the lethality of gun.
  • What's interesting, though, is that the lethality of the attacks has actually increased.

lethally

adverb
More example sentences
  • Speaking as a comic book writer, these powers were nothing compared to the flying, teleporting, lethally oscillating guys I usually deal with, but they were interesting all the same.
  • With our common humanity thus now lethally compromised, the way is open for other categories of human life to be progressively declared deficient or undesirable and therefore expendable.
  • However, as vast amounts of money are being invested in this potentially lucrative but lethally dangerous research, it is unlikely our politicians will take any action to put an end to this madness.

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Word of the day flagitious
Pronunciation: fləˈjiSHəs
adjective
(of a person or their actions) criminal; villainous