| nominal(adjective, feature, characteristic) |
| designful(adjective, feature, characteristic, unrewarded, unremunerated) |
| discretional(adjective, feature, characteristic, unrewarded, unremunerated) |
| due(adjective, voluntary, unpaid, honorary) |
| free-willed(adjective, feature, characteristic, unrewarded, unremunerated) |
| unforced(adjective, feature, characteristic, unrewarded, unremunerated) |
| celebratory(adjective, feature, characteristic) |
| chosen(adjective, feature, characteristic) |
| congratulatory(adjective, feature, characteristic) |
| contributed(adjective, voluntary, unpaid, honorary) |
| deliberate(adjective, feature, characteristic) |
| donated(adjective, voluntary, unpaid, honorary) |
| elected(adjective, feature, characteristic) |
| freely(adjective, feature, characteristic) |
| freewilled(adjective, voluntary, unpaid, honorary, unrewarded) |
| intended(adjective, feature, characteristic) |
| intentional(adjective, feature, characteristic) |
| royal(adjective, characteristic) |
| spontaneous(adjective, feature, characteristic) |
| unasked(adjective, feature, characteristic) |