dehortation (n.)

"dissuasion, advice or counsel to the contrary of what is proposed," 1520s, from Late Latin dehortationem (nominative dehortatio), noun of action from past-participle stem of Latin dehortari "to dissuade," from de- "off, away" (see de-) + hortari "to exhort, urge, incite," from PIE root *gher- (2) "to like, want."