This is the 1956th most frequent German word.
erfolglos
Unsuccessful.
The word 'erfolglos' is used as an adjective describing the team's attempt.
Die Mannschaft hat erfolglos versucht, das Spiel zu gewinnen.
The team tried unsuccessfully to win the game.
Here, 'erfolglos' is used in a compound form to describe the attempts.
Nach mehreren erfolglosen Versuchen gab er die Idee auf.
After several unsuccessful attempts, he gave up the idea.
In this sentence, 'erfolglos' qualifies the outcome of her search.