Meaning

• Subject to death; mortal.

• Causing death; lethal.

• Aiming or willing to destroy; implacable; desperately hostile.

  "deadly enemies"

• Very accurate (of aiming with a bow, firearm, etc.).

• Very boring.

• Excellent, awesome, cool.

Meaning

• Fatally, mortally.

• In a way which suggests death.

  "Her face suddenly became deadly white."

• Extremely.