Answers:
Generally speaking deadly means causing or capable of causing death while
deathly means having the physical appearance of death.
DEADLY means likely to cause death, aiming to kill or destroy ("deadly" enemy) or tending to deprive of force or vitality ("deadly" habit, a "deadly" disease), while DEATHLY means fatal; of, relating to, or suggestive of death (his skin had a pale, "deathly" pallor or color to it).
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