Definitions for: Deathly

[adv] in the manner of death; "he was deathly pale"
[adj] having the physical appearance of death; "a deathly pallor"
[adj] causing or capable of causing death; "a fatal accident"; "a deadly enemy"; "mortal combat"; "a mortal illness"

Webster (1913) Definition: Death"ly, a.
Deadly; fatal; mortal; destructive.

Death"ly, adv.
Deadly; as, deathly pale or sick.

Synonyms: dead, deadly, deathlike, fatal, mortal