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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.
av Never Gives Up 18 april 2011
69 16
 
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!"
av Matt Y. H 16 januari 2008
38 44