importunator

from The Collaborative International Dictionary of English v.0.48

Importunator \Im*por"tu*na`tor\
   ([i^]m*p[^o]r"t[-u]*n[=a]`t[~e]r), n.
   One who importunes; an importuner. [Obs.] --Sir E. Sandys.
   [1913 Webster]