IPA: /ˌæpəˈplɛktɪk/
KK: /əˈpɑːplɛktɪk/
Very angry or furious, often to the point of being unable to speak or act normally.
He became apoplectic when he heard the news about the unfair decision.
Apoplectic is formed from "apo-" (meaning away from) and "plektos" (meaning struck or beaten). The term originally described a condition where one is struck down by a sudden loss of consciousness or paralysis, often due to a stroke.
Think of being 'struck down' ('plektos') and 'away from' consciousness ('apo-') — that's why apoplectic refers to a sudden, severe condition.