The word "spiffs" often carries a positive connotation, as it refers to a bonus or incentive that employees receive for meeting certain goals or achieving specific tasks. However, some antonyms for spiffs might include penalties, fines, or other negative consequences for failing to meet job requirements or falling short of expectations. Other antonyms might include unpaid work, overtime, or simply a lack of recognition or appreciation for one's efforts. While spiffs are a common practice in many industries, it's important to ensure that they are used fairly and consistently, without creating a culture of fear, competition, or stress among employees.