persistent
continuing firmly or obstinately
in an opinion or course of action;
continuing to exist or occur over a prolonged period
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persist
persistent
persistence
persist in
endure untiringly
perseverant
perseverance
firm and persistent
fortitude and dedication
with unswerving determination
doughty
intrepid
strong and brave
brave and persistent
bite at or nibble something persistently
bite at or nibble something persistently
urge persistently
pressurize continually
hasten a person's death