Without any doubt; absolutely certain

संदेह के परे; पूर्णतः निश्चित

English Usage: His innocence was proven beyond any doubt.

Hindi Usage: उसकी निर्दोषता निस्संदेह साबित हो गई।

Certainly; without any restriction or limitation

बिलकुल, अवश्य, यकीनन

English Usage: By all means, you can borrow my car.

Hindi Usage: निःसंदेह, आप मेरी कार उधार ले सकते हैं।

Lacking good reason; unprovoked.

बिना कारण का; प्रेरित नहीं

English Usage: His comments were seen as gratuitous insults.

Hindi Usage: उसकी टिप्पणियाँ निःसंदेह अपमान के रूप में देखी गईं।