Not recognized or acknowledged

मान्यता प्राप्त नहीं

English Usage: The unrecognised talent was finally discovered.

Hindi Usage: मान्यता प्राप्त नहीं प्रतिभा अंततः खोजी गई।

To not identify or acknowledge someone or something

पहचानना नहीं

English Usage: They unrecognised his efforts to improve the project.

Hindi Usage: उन्होंने परियोजना को सुधारने के लिए उनके प्रयासों को पहचाना नहीं।