persistent
adjective uk/pəˈsɪs.tənt/ us/pɚˈsɪs.tənt/
持续的;存留的;顽强存在的
lasting for a long time or difficult to get rid of
a persistent smell/skin rash 持续不散的气味／顽固的皮疹
Symptoms of the illness include a high temperature and a persistent dry cough. 病症包括高烧和持久的干咳。
There have been persistent rumours that the principal might take early retirement. 不断有谣言说校长可能会提前退休。
C2 坚持不懈的；执意的
Someone who is persistent continues doing something or tries to do something in a determined but often unreasonable way.
Be persistent - don't give up. 要坚持不懈——别放弃。
He has been a persistent critic of the president. 他一贯对总统持批评态度。
She is a persistent offender and has been arrested five times this year for shoplifting. 她是个惯犯，今年已5次因在商店行窃被捕。