Prohibited or not allowed

निषिद्ध

English Usage: The forbidden fruit was tempting.

Hindi Usage: निषिद्ध फल लुभावना था।

To refuse to allow something

मना करना

English Usage: The teacher will forbid us from using our phones in class.

Hindi Usage: शिक्षक कक्षा में हमारे फोन का उपयोग करने को मना करेंगे।

An act of forbidding

निषेध

English Usage: His forbiddance of the project was unexpected.

Hindi Usage: उनके द्वारा परियोजना का निषेध अप्रत्याशित था।