Definition of ぜんせんぜんぱい
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(n) failed at every attempt; defeated in every (match, battle, etc.)
なぜかうまくいかず、目下全戦全敗、「彼女いない歴=自分の年齢」という寂しい生活を送っていました。
For some reason it didn't go well, shot down at every attempt, and he led a sad "History of no girlfriend = Age" life.