Source : Webster's Revised Unabridged Dictionary (1913)

Persuasive \Per*sua"sive\, n.
   That which persuades; an inducement; an incitement; an
   exhortation. -- {Per*sua"sive*ly}, adv. --
   {Per*sua"sive*ness}, n.

Persuasive \Per*sua"sive\, a. [Cf. F. persuasif.]
   Tending to persuade; having the power of persuading; as,
   persuasive eloquence. ``Persuasive words.'' --Milton.

Source : WordNet®

persuasive
     adj 1: tending or intended or having the power to induce action or
            belief; "persuasive eloquence"; "a most persuasive
            speaker" [ant: {dissuasive}]
     2: capable of convincing; "a persuasive argument"; "the
        evidence is persuasive but not conclusive"