adjective, dead·li·er, dead·li·est.
- deadly nightshade,
- deadly sins,
Origin of deadly
Examples from the Web for deadliest
The country is also sixth deadliest when it comes to the gender-motivated killing of women.
Melanoma, the deadliest form of skin cancer, has seen a 200 percent increase in cases since 1973.
It was the deadliest single bomb on London of the war—161 people died.Life Under Air Strikes: Children Under Fire Will Never Forget — or Forgive|Clive Irving|August 3, 2014|DAILY BEAST
The dispute over the rockets comes as the fighting in Gaza entered its deadliest day.
As the Gaza war marks its deadliest day so far, Palestinians seek safety and rely on each other.Palestinians Fleeing Israeli Bombardment in Gaza Have ‘Nowhere Left to Run’|Jesse Rosenfeld|July 20, 2014|DAILY BEAST
It had been done, he said, with two separate kinds of poison, both of the deadliest nature.The Giraffe Hunters|Mayne Reid
The head master held poaching to be the deadliest of sins, and poaching on Fernwood especially heinous.The Arrival of Jimpson|Ralph Henry Barbour
So, use it with intent: The deadliest arm in beauty's armament!Fifty Contemporary One-Act Plays|Various
Overconfidence and complacency are among our deadliest enemies.State of the Union Addresses of Franklin D. Roosevelt|Franklin D. Roosevelt
The summer which had just passed had witnessed one of the deadliest attacks of this disease.The Great Lone Land|W. F. Butler
adjective -lier or -liest
Old English deadlic "mortal, subject to death," also "causing death;" see dead + -ly (1). Meaning "having the capacity to kill" is from late 14c. (Old English words for this included deaðbærlic, deaðberende).