supererogatory

adjective2

1. •
   Pertaining to supererogation; doing more than is required.

   • They passed into the ancient shipyard which lay beyond, and which was now a mere vague, grass-grown approach to the waterside, bestrewn with a few remnants of supererogatory timber. — 1885
2. •
   Of a deed or action, morally benevolent and exceeding the strict requirement of God.