Meaning of “persistent” in the English Dictionary

"persistent" in British English

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persistentadjective

uk /pəˈsɪs.tənt/ us /pɚˈsɪs.tənt/

lasting for a long time or difficult to get rid of:

a persistent smell/skin rash
Symptoms of the illness include a high temperature and a persistent dry cough.
There have been persistent rumours that the principal might take early retirement.

C2 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.
He has been a persistent critic of the president.
She is a persistent offender and has been arrested five times this year for shoplifting.
persistently
adverb uk /pəˈsɪs.tənt.li/ us /pɚˈsɪs.tənt.li/

They have persistently ignored our advice.

(Definition of “persistent” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"persistent" in American English

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persistentadjective

us /pərˈsɪs·tənt, -ˈzɪs-/

continuing to exist past the usual time, or continuing to do something in a determined way even when facing difficulties or opposition:

a persistent cough
persistent rumors
persistently
adverb us /pərˈsɪs·tənt·li, -ˈzɪs-/

The rains persistently fell.

(Definition of “persistent” from the Cambridge Academic Content Dictionary © Cambridge University Press)