deadlier
ˈdɛdli
adjective
causing or able to cause death.
a deadly weapon
fatal,lethal,mortal,death-dealing,life-threatening,dangerous,destructive,injurious,harmful,pernicious,detrimental,deleterious,unhealthy,noxious,toxic,poisonous,terminal,incurable,untreatable,malignant,deathly,nocuous,mephitic,baneful