Example Sentences:

Ramayana:  Vibhishana knew that Ravana would be ruthless in destroying anyone who dared to betray him, yet he chose to go over to Rama’s side. 

Mahabharata:  Shakuni was a ruthless manipulator who didn’t hesitate to burn alive not just the Pandavas but even their elderly mother.

Bhagavad-gita:  Lust can be such a ruthless enemy that it can destroy everything we hold sacred, not just in this lifetime, but lifetime after lifetime.