cogent

cogent adjective appealing conclusively, appealing forcibly, authoritative, commanding, compelling, conclusive, convincing, definite, definitive, demonstrable, demonstrating, determinative, effective, effectual, efficacious, evidential, forceful, forcible, incontestable, incontrovertible, indubitable, inducive, influential, irrefragable, irrefutable, irresistible, meritorious, of consequence, past dispute, persuasive, potent, powerful, puissant, reliable, solid, sound, strong, suasive, substantial, telling, to the point, trenchant, trustworthy, unanswerable, unconfuted, undeniable, undoubted, unequivocal, unquestionable, valid, veridical, weighty, well-founded, well-grounded

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See also: certain, clear, coherent, convincing, important, influential, irresistible, logical, persuasive, potent, powerful, predominant, sound, urgent