insistent in WordNet English dictionary

1. demanding attention
   "clamant needs"; "a crying need"; "regarded literary questions as exigent and momentous"- H.L.Mencken; "insistent hunger"; "an instant need"
   clamant  crying  exigent  insistent  instant 
   
2. repetitive and persistent
   "the bluejay's insistent cry"
   insistent  repetitive