Cogent (?), a. [L. cogens, p. pr. of cogere to drive together, to force; co- + agere to drive. See Agent, a., and cf. Coact to force, Coagulate, p. a.] 1. Compelling, in a physical sense; powerful. [Obs.]
[1913 Webster]

The cogent force of nature. Prior.
[1913 Webster]

2. Having the power to compel conviction or move the will; constraining; conclusive; forcible; powerful; not easily reasisted.
[1913 Webster]

No better nor more cogent reason. Dr. H. More.
[1913 Webster]

Proofs of the most cogent description. Tyndall.
[1913 Webster]

The tongue whose strains were cogent as commands,
Revered at home, and felt in foreign lands. Cowper.

Syn. -- Forcible; powerful; potent; urgent; strong; persuasive; convincing; conclusive; influential.
[1913 Webster]