Service that results in harm; an (intentionally or unintentionally) unhelpful, harmful action.
One renders young people a disservice by heaping unearned rewards on them.
To disserve, to provide a disservice to; to provide harmful or inadequate service to.
A wrongful act, whether intentional or negligent, regarded as non-criminal and unrelated to a contract, which causes an injury and can be remedied in civil court, usually through the awarding of damages.
Synonym of tart (“sharp- or sour-tasting; (figuratively) keen, severe, sharp”)