i Register
In some senses, deadly is marked as obsolete, informal, rare. Watch for register when choosing this word.
ADJ.
all, horrible, mad, many, most, odorless, serious, tired
Carbon monoxide is a deadly and odorless gas that can kill you silently.
VERB + DEADLY
became, born, cloud, dealt, dipped, erceiving, face, fighting
The boxer dealt a deadly blow to his opponent in the final round.
DEADLY + NOUN
danger, disease, heart, illness, life, mankind, others, pectators
Cancer is a deadly disease that affects millions of people worldwide.
PREP.
in, in, than, till
The poison was more deadly than anything the doctor had ever seen before.
ADV.
perfectly, suddenly
The poison worked perfectly deadly, killing the rats within hours of exposure.