Terminally

adverb

1. In a terminal manner.
2. Leading to death; lasting until death.

   "2009, Stefanie Wilder-Taylor, It's Not Me, It's You: Subjective Recollections from a Terminally Optimistic, Chronically Sarcastic, and Occasionally Inebriated Woman."

3. (of missile guidance) To the target.

   "terminally guided"

4. (location) At the end.