Synonyms and related words :
authoritative, cajoling, charismatic, charming, consequential, effective, effectual, efficacious, enchanting, estimable, exhortative, exhortatory, hortative, hortatory, important, influential, magnetic, momentous, personable, persuading, persuasive, potent, powerful, prestigious, reputable, strong, substantial, telling, weighty, wheedling, winning