1. Work or labor that is unappreciated, unrewarded, or for which one receives no gratitude or recognition despite effort and dedication
Cleaning up after the party was thankless work, and nobody even said thank you.
Limpar a bagunça da festa foi um trabalho ingrato, e ninguém sequer disse obrigado.
2. A task that is tedious, difficult, or unpleasant with little prospect of acknowledgment or compensation
Teaching often feels like thankless work when students don't appreciate your efforts.
Ensinar muitas vezes parece um trabalho ingrato quando os alunos não apreciam seus esforços.