cogent
adjective
(of an argument or case) clear, logical, and convincing.
they put forward cogent arguments for British membership
convincing,compelling,strong,forceful,powerful,potent,weighty,valid,sound,well founded,plausible,effective,efficacious,telling,impressive,persuasive,irresistible,eloquent,credible,influential,conclusive,unanswerable,authoritative,logical,reasoned,well reasoned,rational,reasonable,lucid,coherent,well organized,systematic,orderly,methodical,clear,articulate,consistent,relevant