The act of contravening a rule, regulation, or law, or of not fulfilling an obligation, promise, or agreement.
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”)