I. adjective 1.
‹informal› overcome with anger; furious
• Mark was apoplectic with rage at the decision.
‹dated› relating to or denoting apoplexy (stroke)
• an apoplectic attack.
II. derivatives apoplectically adverb
– origin early 17th cent.: from French apoplectique or late Latin apoplecticus, from Greek apoplēktikos, from apoplēssein ‘disable by a stroke’.