munificence
The OED defines "munificence" as: The quality of being munificent; great generosity or liberality in giving.
The word is used for a mysterious Count showing that the Duke is aware that his story may have been off-putting, and he must now save face by praising his new socio-political target. However, to use a word that is antithetical to who the Duke is draws larger parallels between who he associates with, who he pretends to be, and who he really is. The Duke is not giving in the sense that he should be praised, he is giving in the sense that gives people reasons to fear him. By praising this Count's munificence, he can downplay his own lack of it.
