A cogent reason, argument, or example is strong and convincing.
There were perfectly cogent reasons why Julian Cavendish should be told of the Major's impending return.
The film makes its points with cogency and force.
Translation English Cobuild Collins Dictionary
compelling, compulsive, conclusive, convincing, effective, forceful, forcible, influential, irresistible, potent, powerful, strong, urgent, weighty
English Collins Dictionary - English synonyms & Thesaurus
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