Faithfulness to a person, cause, or belief.

निष्ठा

English Usage: His fidelity to his friends is unwavering.

Hindi Usage: उसकी दोस्तों के प्रति निष्ठा अडिग है।

Accuracy in details; exactness.

सटीकता

English Usage: The fidelity of the reproduction was impressive.

Hindi Usage: प्रजनन की सटीकता प्रभावशाली थी।

To trust or have confidence in.

विश्वास करना

English Usage: You can fid me to keep your secrets safe.

Hindi Usage: आप मुझ पर विश्वास कर सकते हैं कि मैं आपके राज़ सुरक्षित रखूंगा।