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1.
Unrelenting, someone who never gives up. Ceaseless.

Note: in no way related to a certain Erich who in fact notably fails at persistence.
Erich, being persistent is not your forte. You give in too easily.
od uživatele Never Gives Up 18. Duben 2011
 
2.
Matt H. A person who is very unwilling to fail
"Matt H., If I were to look up persistent in the dictionary I would find your name!"
od uživatele Matt Y. H 16. Leden 2008