Cogent

His speech was a properly constructed and cogent argument, which – at least in my experience – feels like a complete rarity.

It's not the most cogent argument.

One of the most important skills a debater can have is to deliver cogent arguments in a clear manner.

To disturb a Nomenclature of long standing, to set aside terms in familiar use, and to set up others in their place which are strange, and therefore at first unintelligible, involves an interruption of that facility with which we are accustomed to communicate with one another on any given subject, that is only to be justified by reasons of a cogent and satisfactory nature.

We congratulate our correspondents on some very cogent reasoning, and shall have to watch our step even more carefully in future!

Clearly, the mere fact that some Emergentists may in practice have made use of invented examples in testing their theories does not tell against any cogent general objections they may have offered to such practice. What is needed is a decision on the methodological point, not just a cry of “You did it too!”.

The prosecution presented a cogent argument, convincing the jury of the defendant's guilt.