persevere - definition and synonyms

verb [intransitive] 

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/ˌpɜː(r)sɪˈvɪə(r)/
present tense
I/you/we/theypersevere
he/she/itperseveres
present participlepersevering
past tensepersevered
past participlepersevered
  1. to continue trying to achieve something difficult
    persevere in/with:

    Police negotiators will persevere with their efforts to free the hostages.