Source : Webster's Revised Unabridged Dictionary (1913)

Importunate \Im*por"tu*nate\, a. [See {Importune}.]
   1. Troublesomely urgent; unreasonably solicitous;
      overpressing in request or demand; urgent; teasing; as, an
      impotunate petitioner, curiosity. --Whewell.

   2. Hard to be borne; unendurable. [R.] --Donne. --
      {Im*por"tu*nate*ly}, adv. -- {Im*por"tu*nate*ness}, n.

Source : WordNet®

importunate
     adj : expressing earnest entreaty; "the appealing and frightened
           look worn by an injured dog"; "she holds out her hand
           for money, importunate, insistent"; "a pleading note in
           her voice" [syn: {appealing}, {imploring}, {pleading}]