facundity

• Right and wrong stand fast, and cannot be changed by any facundity. —  Slain By The Doones
• But this engrained fecundity and facundity of hers inevitably make her work novel-journalism rather than novel-literature in all points but in that of style, which has been discussed already. [ —  A History of the French Novel, Vol. 2 To the Close of the 19th Century
• With this, I sat down, leaving my audience as _sotto voce_ as fishes with admiration and amazement at the facundity of my eloquence, and should indubitably have been the recipient of innumerable felicitations but for the fact that Miss SPINK, suddenly experiencing sensations of insalubriousness, requested me, without delay, to conduct her from the assemblage. —  Baboo Jabberjee, B.A.
• National Congress, and so forth; upon which, being now perfectly reassured and at my ease, I discoursed with facundity, and did loudly extol the intellectual capacity of the Bengalis, as evinced by marvellous success in passing most difficult exams., and denouncing it as a crying injustice and beastly shame that fullest political powers should not be conceded to them, and that they should not be eligible for all civil appointments _pari passu_, or even in priority to Englishmen. —  Baboo Jabberjee, B.A.
• There had been a time when Chouteau, thanks to his facundity of the faubourg, had interested and almost convinced him, but now he had come to detest that apostle of falsehood, that snake in the grass, who calumniated honest effort of every kind in order to sicken others of it. —  The Downfall

Roget's II: The New Thesaurus