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 ;