piacular

adj

1. Requiring atonement or reparation: wicked, sinful, bad.

   “And while we think it ſo piaculous, to go beyond the Ancients; we muſt neceſſarily come ſhort of genuine Antiquity, Truth; unleſs we ſuppoſe them to have reach'd perfection of Knowlege in ſpight of their own acknowledgments of Ignorance.”

2. Expiatory; serving to atone.

   “The piacular sacrifice arose from the need of atoning for bloodshed within the kinship group ; properly speaking, the culprit himself should suffer : should he be unknown or beyond the reach of vengeance, a substitute had to be found[…]”

   “The distinction between clean and unclean beasts and birds was made, a distinction which has its principal significance in reference to a piacular offering. Not any and everything may be offered as an atonement, but only that which is [clean].”