A complete or utter defeat; being overwhelmingly beaten in sports, competition, debate, etc.
試合は相手の強さの前に完敗だった。
The match was a complete defeat in the face of the opponent's strength.
我々の提案は審査で完敗し、採用されなかった。
Our proposal was decisively rejected in the review and was not adopted.
あのチームには戦術面で完敗したと認めざるを得ない。
We must admit we were completely outplayed by that team tactically.