convincing or believable by virtue of forcible, clear, or incisive presentation; telling.

to the point; relevant; pertinent.

adjective

impotent , ineffective , invalid , weak

adjective

apposite , apt , compelling , conclusive , consequential , convictive , convincing , fitting , forceful , forcible , inducing , influential , irresistible , justified , meaningful , momentous , persuasive , pertinent , potent , powerful , puissant , relevant , satisfactory , satisfying , significant , solid , sound , strong , suasive , telling , urgent , valid , weighty , well-grounded , just , tight , well-founded , effective , legitimate , trenchant