Douglas Harper's Etymology Dictionary
1748, from un- (1) "not" + persuasive (adj.). Related: Unpersuasively.
Wiktionary
a. Not persuasive
WordNet
adj. not capable of persuading
Usage examples of "unpersuasive".
She had often seen men outside the Surratt boarding house lately, men who busied themselves in unpersuasive activities when she passed them.
Dylan stood frozen in his stupid backpack and unpersuasive Pro Keds in the innocent afternoon, his arms numb, blinking his eyes at Mingus.
As the sequence proceeds, there is a greater sense of honesty and lucidity, a sharper awareness of the risks of living in a changing world, but if we concentrate on Mathieu, Gomez and Brunet in their public or political roles, we are struck by the ultimately unpersuasive character of all their modes of commitment.
Though an inference of guilt can sometimes be drawn from the face of an inconsistent and unpersuasive decision, an inference of innocence can never be drawn from the face of an opinion alone, regardless of how brilliant or consistent it may be.
Does he care to say what is unpersuasive about the evidence adduced by so many historians and participants, from the hawkish Bundy and Haldeman to the more skeptical Clark Clifford?
When every speaker on a broadcast has the presence of a Winston Churchill or a Martin Luther King, we’ll begin to regard ordinary people, with their average use of paralinguistic cues, as bland and unpersuasive.