dogged
/ˈdȯ-gəd/
adjective
marked by stubborn determination
a dogged competitor
verb
to hunt, track, or follow (someone) like a hound
to be a persistent source of difficulty or distress to (someone) : plague —often used in the passive with by
to bother or pester (someone) persistently : hound
dogged her every move
Rumors dogged him throughout his public life.