deprecative (adj.)

mid-15c., "praying for deliverance from evil," from Old French deprecatif (13c.) and directly from Late Latin deprecativus, from deprecat-, past-participle stem of Latin deprecari "plead in excuse, avert by prayer," literally "to pray (something) away," from de "away" (see de-) + precari "to pray" (from PIE root *prek- "to ask, entreat").  Related: Deprecatively.