umsonst

adverb
  1. without cost; free of charge adverb
    The concert tickets were umsonst, so we didn't have to pay anything.
    She received the service umsonst as part of the promotion.
  2. in vain; without success or result adverb
    He tried to fix the car umsonst, as it still wouldn't start.
    All their efforts were umsonst because the event was canceled.