apoplectic \ap-uh-plek-tik, adjective:

1. Intense enough to threaten or cause a stroke.
2. Of or pertaining to apoplexy.
3. Having or inclined to apoplexy.

noun:
1. A person having or predisposed to apoplexy.

When Abie used to shout, Rebecca always used to make a joke that he was having one of his apoplectic fits.
— Alan Grayson,Mile End

…four years, one recession and a host of battles — over financial regulation and the nomination of Elizabeth Warren, over Dodd-Frank and the Buffett Rule — have taken their toll. Some on Wall Street are apoplectic. One former supporter, Dan Loeb, compared Obama to Nero; the president’s enemies insinuated worse.
— Nicholas Confessore, “Obama’s Not-So-Hot Date With Wall Street”,The New York Times Magazine, May 2, 2012

Apoplectic stems from the Greek word apoplēktikós which meant “pertaining to stroke”. It literally meant “struck down”.