supererogatory

Those arguments are not necessary, they are all supererogatory, like idle words.

This: Do be good to us by a supererogatory virtue and write to us.

John Bull has suffered more for their sake, more than even the supererogatory cullibility of his disposition is able to bear.

That design was secured with a care and finish which in many instances might seem altogether supererogatory.

To speak panegyrically of his prowess, is supererogatory; as his bravery has been the theme of history and of song.