"Wasted labors" refers to efforts or work that have been unsuccessful or yielded no results. Some synonyms for this phrase are:
1. In vain: Attempts that have been made without success.
2. Fruitless: Work that has not borne any fruit or results.
3. Unproductive: Efforts that have not been productive or yielded any outcome.
4. Failed: Work that has not achieved the desired goal or objective.
5. Pointless: Efforts that have no purpose or benefit.
6. Futile: Work that has no chance of succeeding or making a difference.
7. Unsuccessful: Attempts that have not been successful or achieved the desired outcome.
8. Useless: Work that has no practical value or purpose.
9. Empty: Efforts that have no substance or significance.
10. Vainly: Work that has been done in an ineffective and pointless manner.