accursed (adj.)

Middle English cursen, from Old English cursian, "to wish evil to; to excommunicate," from the source of curse (n.). Intransitive meaning "swear profanely, use blasphemous or profane language" is from early 13c. (compare swear (v.)). The sense of "blight with malignant evils" is from 1590s. Related: Cursed; cursing.

Middle English anelen, from Old English onælan "to set on fire, kindle; inspire, incite," from on- "on" (see an- (1)) + ælan "to burn, bake," from Proto-Germanic *ailan, "probably" [Watkins] from the same PIE root meaning "to burn" that is the source of ash (n.1). It is related to Old English æled "fire, firebrand," Old Norse eldr, Danish ild "fire."

The -n- was doubled after c. 1600 by analogy of Latinate words (annex, etc.; compare accursed, afford, allay). Meaning "to treat by heating and gradually cooling" (of glass, earthenware, metals, etc., to toughen them) was in late Old English. Related: Annealed; annealing.