English

Adjective

maleficial ‎(comparative more maleficial, superlative most maleficial)

1. (archaic) injurious, damaging
   • Thomas Fuller, The Church History of Britain

     The late mention of the prelates' advice, in passing a law so maleficial unto them, giveth me just occasion to name some, the principal persons of the clergy, present thereat […]

Antonyms

• beneficial