ungentle

adjective2

1. •
   Showing a lack of gentleness, kindness or compassion.

   • […] Moyses lawe, thoughe it were vngentle and sharpe […] yet it punnyshed thefte by the purse, and not wyth deathe. — 1551
2. •
   (no longer used) Not acting according to accepted ethics or standards of behaviour.

   • What more deceit? then look thy Fréend in face: / And woork his death, in most vngentle case. — 1579