persevere
1. [ verb ] be persistent, refuse to stop
Synonyms: persist hang_on hold_on hang_in
Examples:

"he persisted to call me every night" "The child persisted and kept asking questions"

Related terms: continue stick_to plug obstinate ask_for_it doggedness perseverance
Similar spelling:   perseverate
  perseverance
  persevering
  perspective
  perspirer
  Persepolis
  Persephone
  Perspex