/ pəˈsɪstənt; NAmE pərˈs-/ adjective
1.
determined to do sth despite difficulties, especially when other people are against you and think that you are being annoying or unreasonable :
How do you deal with persistent salesmen who won't take no for an answer?
a persistent offender (= a person who continues to commit crimes after they have been caught and punished)
2.
continuing for a long period of time without interruption, or repeated frequently, especially in a way that is annoying and cannot be stopped
SYN unrelenting :
persistent rain
a persistent cough
► per·sist·ent·ly adverb :
They have persistently denied claims of illegal dealing.
persistently high interest rates