deathly

adj

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

   “He has a deathly pallor.”

   “I rushed towards her, and embraced her with ardour; but the deathly languor and coldness of the limbs told me, that what I now held in my arms had ceased to be the Elizabeth whom I had loved and cherished.”

2. Deadly, fatal, causing death.
3. Extreme.

   “He has a deathly fear of crocodiles.”

adv

1. In a way that resembles death.

   “He was deathly pale.”

2. Extremely, dreadfully.

   “The water was deathly cold.”

   “He was deathly afraid of crocodiles.”

   “And indeed, [Sydney] Sweeney’s quotes are deathly dull. On changing her body for “Christy,” she said: “It’s so fun just not being yourself.””