"deadlier" in the adjective sense
1. deadly, deathly, mortal
causing or capable of causing death
"a fatal accident"
"a deadly enemy"
"mortal combat"
"a mortal illness"
2. deadly, lethal
of an instrument of certain death
"deadly poisons"
"lethal weapon"
"a lethal injection"
3. deadly, venomous, virulent
extremely poisonous or injurious producing venom
"venomous snakes"
"a virulent insect bite"
4. deadly, mortal
involving loss of divine grace or spiritual death
"the seven deadly sins"
5. baneful, deadly, pernicious, pestilent
exceedingly harmful
6. deadly
of a disease) having a rapid course and violent effect
Source: WordNet® (An amazing lexical database of English)
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