persistent
Pronunciation:
/pəˈsɪstənt//pɚˈsɪstənt/adjective
Definitions
Obstinately refusing to give up or let go.
Example: She has had a persistent cough for weeks.
Insistently repetitive.
Example: There was a persistent knocking on the door.
Indefinitely continuous.
Example: There have been persistent rumours for years.
Lasting past maturity without falling off.
Example: Pine cones have persistent scales.