"Wert loser" is an unusual term, and because it is not familiar to most English speakers, it is difficult to give antonyms for it. However, the word "worthless" is similar in meaning, and its antonyms include "valuable," "useful," "desirable," "important," and "significant." In general, any word that is opposite in meaning to "worthless" could also be considered an antonym for "wert loser." Other antonyms might include "beneficial," "advantageous," "helpful," "valued," and "worthy." Ultimately, the choice of antonym may depend on the context in which "wert loser" is being used, as well as personal preferences and opinions.