| contributed(voluntary, honorary) |
| donated(voluntary, honorary) |
| gratuitous(voluntary, honorary) |
| honorary(voluntary, unrewarded, unremunerated) |
| uncompensated(adjective, unpaid, unrewarded, unremunerated) |
| unindemnified(voluntary, honorary, unrewarded, unremunerated) |
| unpaid(adjective, free, voluntary, honorary, unrewarded) |
| unrecompensed(adjective, unpaid, unrewarded, unremunerated) |
| unremunerated(adjective, unpaid, unrewarded) |
| unrewarded(voluntary, honorary, unremunerated) |
| unsalaried(adjective, voluntary, unpaid, honorary, unrewarded) |
| voluntary(witting, honorary, unrewarded, genealogical, unremunerated) |
| volunteer(voluntary, honorary, unrewarded, unremunerated) |
| amateur(voluntary, honorary) |
| decided upon(expression, witting, uncompelled) |
| deputed(witting, uncompelled) |
| designful(witting, voluntary, unrewarded, genealogical, unremunerated) |
| discretional(witting, voluntary, unrewarded, genealogical, unremunerated) |
| due(voluntary, honorary) |
| free(adjective, voluntary, unwelcome, unwanted, honorary) |