importunate

adj. persistently demanding; annoying; pressing, urgent

Adjective
1. 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"
(synonym) appealing, imploring, pleading
(similar) beseeching

v. trouble, annoy, bother, importune

v. importune, pester, harass with insistent demands, persistently beseech

(a.)
Troublesomely urgent; unreasonably solicitous; overpressing in request or demand; urgent; teasing; as, an impotunate petitioner, curiosity.
  

(a.)
Hard to be borne; unendurable.