cogency

[ koh-juh n-see ]

/ ˈkoʊ dʒən si /

the quality or state of being convincing or persuasive: The cogency of the argument was irrefutable.

Origin of cogency

First recorded in 1680–90; cog(ent) + -ency

non·co·gen·cy, noun

Unfortunately, Vermeulen lacked an air of cogency, most likely due to nerves, and was not as convincing.

The Prosecution vs. Oscar Pistorius: The Case So Far |Kelly Berold |March 28, 2014 |DAILY BEAST
I have attended a few of his talks, which are blessed with cogency, wit, and deeply researched and clearly presented arguments.

The Nerds Who Won World War II |Marc Wortman |February 7, 2013 |DAILY BEAST
Burke would have agreed entirely, and admired the cogency of so few words.

Obama is the Real Conservative |Jeffrey Hart |October 31, 2008 |DAILY BEAST
The nature of this Argument stated, and its cogency insisted upon.

A Candid Examination of Theism |George John Romanes

Six brothers and sisters were more than any one could adopt on the spot, and Mr. Underwood felt the cogency of the argument.

The Pillars of the House, Vol. II (of 2) |Charlotte M. Yonge
Chief Justice Draper argued his case with great clearness and cogency, and made an excellent impression upon the Committee.

The Remarkable History of the Hudson's Bay Company |George Bryce
“You expect a cogency of conduct not usual in women,” said Marlow.

Chance |Joseph Conrad
It is extremely difficult to estimate the value and cogency of this argument.

A Commentary to Kant's 'Critique of Pure Reason' |Norman Kemp Smith