importune - definition and synonyms

verb [transitive] very formal 

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/ˌɪmpə(r)ˈtjuːn/
present tense
I/you/we/theyimportune
he/she/itimportunes
present participleimportuning
past tenseimportuned
past participleimportuned
  1. to keep asking someone for something in a determined and annoying way