心腹大患 xīnfùdàhuàn mortal malady Origin Definitions Defs Strokes Stroke Words Sentences Sents 心腹 xīnfù vital part (bound form) a strategic position or essential part of something; a vital area大 dà adjective big big; large; great; vast; high in scale or intensity; (of a person) old; adult患 huàn adjectivenoun misfortune (bound form) disaster; calamity; peril; trouble