[Middle English acursed, past participle of acursen, to put a curse on : a-, intensive pref. (from Old English ā-) + Old English cursian, to curse (from curs, curse).] ac·curs'ed·ly adv., ac·curs'ed·ness n.
c.1220, acursede "lying under a curse," pp. of obs. acursen "pronounce a curse upon, excommunicate," from a- intens. prefix + cursein (see curse). The extra -c- is 15c., mistaken Latinism. Weakened sense of "worthy of a curse" is from 1591.