deadlier; deadliest
Definition of deadly
(Entry 1 of 2)
1
: likely to cause or capable of producing death
deadly poison
2a
: aiming to kill or destroy : implacable
a deadly enemy
b
: highly effective
a deadly exposé
c
: unerring
a deadly marksman
d
: marked by determination or extreme seriousness
3a
: tending to deprive of force or vitality
a deadly habit
b
: suggestive of death especially in dullness or lack of animation
deadly bores a deadly conversation
4
: very great : extreme
deadly
adverbDefinition of deadly (Entry 2 of 2)
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Merriam-Webster unabridged
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Time Traveler for deadly
The first known use of deadly was before the 12th century
See more words from the same century