What's the "een" in Halloween?
1530s (implied in abusively), originally "improper," from Middle French abusif, from Latin abusivus, from abus-, past participle stem of abuti (see abuse (v.)). Meaning "full of abuse" is from 1580s. Abuseful was used 17c., and Shakespeare has abusious ("Taming of the Shrew," 1594). Related: Abusiveness.