malefitn.

1755 C. Charke Narr. Life 240 I took it into my head to try for a benefit, and to that end printed some bills..but..instead of five and twenty pounds, I had barely four... The morning after my malefit, I was obliged to strip my friend of the ownly decent gown she had, and pledged it to pay the players.

a1812 E. Helme Mod. Times (1814) I. ix. 195 This benefit, or, as some would call it, malefit, they had profited by to such a superlative degree of eminence, that [etc.].

1898 E. S. Mott Mingled Yarn viii. 86 A double-barrelled..rifle (one barrel capable of carrying a heavy bullet for the malefit of such wild elephants, bison, or rhinoceros as might be encountered during my travels).

a1973 J. R. R. Tolkien in C. Tolkien Hist. Middle-earth: Sauron Defeated (1992) ii. 196 Some very potent fiction is specially composed to be inspected by others and to deceive, to pass as record; but it is made for the malefit of Men.

1983 P. Howard Word in your Ear (1985) 51 Malefactors used to commit malefactions. Why could they not still be said to do so, rather than disbenefits, or, perhaps, stretching a point, commit malefits?

1989 A. Burgess Any Old Iron i. 37 He would be dead by day's end without malefit of Hun guns.