"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.