Example Sentences:

Ramayana:  Although Vibhishana sensed that speaking any further to Ravana was otiose, he still decided to make one last-ditch effort.

Mahabharata:  Despite knowing that speaking to Duryodhana was otiose, Krishna went as a peace messenger to show the world that the Pandavas did everything possible to avoid war.

Bhagavad-gita:  Whatever efforts we make to grow spiritually are never otiose; our spiritual credits are carried over from this life to the next.