be persistent

See: recur
References in periodicals archive ?
According to the research, since the overproduction of melanine is induced by endothelin and SCF even if the skin is no longer exposed to ultraviolet rays, skin flecks tend to be persistent.
"Proclaim the message; be persistent whether the time is favorable or unfavorable" (4:2).
We will just have to be persistent, patient, and above all, faithful.
SSRI-induced tinnitus, which tends to be persistent despite discontinuation, is treated the same as tinnitus from other causes.