This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, resembling, or characteristic of death: a deathly silence.

adj. Causing death; fatal.

ad. In the manner of death.

ad. Extremely; very: The night was deathly cold.

adj. Appearing as though dead, or on the verge of death.

adj. Fatal, causing death.

adj. Extreme.

ad. With reference to death.

ad. Extremely, dreadfully.

adj. Deadly; fatal; mortal; destructive.

ad. Deadly.

Like or characteristic of death; partaking of the nature or appearance of death: as, a deathly swoon; deathly pallor.

Threatening death; fatal; mortal; deadly.

Synonyms See deadly.

So as to resemble a dead person, or death.

ad. to a degree resembling death

adj. causing or capable of causing death

adj. having the physical appearance of death

"Any sense of trepidation surrounding Haneke’s vision of a post-apocalyptic existence is heightened by his movie’s title sequence, which unfolds in deathly silence, white words on a black screen, and lasts for what seems like an eternity."

fatal    dead   

deadly    fatal    mortal    destructive    deathlike   

deathlike    ashy    clammy    livid    ghastly    unearthly    waxen    numb    expressionless    sickly