C2 adjective /ʌnˈtiːtʃəbəl/
unteachable
जिसे सिखाया न जा सके
Meaning
not able or willing to learn; resistant to instruction or guidance
Example
He was so stubborn that he became almost unteachable.
वह इतना जिद्दी था कि लगभग जिसे सिखाया न जा सके ऐसा हो गया।