The antonyms for wast slothful would be industrious, productive, diligent, active, efficient, hardworking, motivated, painstaking, and persistent. Instead of wasting time, an industrious person would be focused on completing tasks efficiently and effectively. An active person would be engaged in physical or mental activity instead of being idle. Diligent people are thorough and attentive to detail, ensuring that their work is of the highest quality. Rather than being slothful, a motivated person would have a strong desire to achieve their goals and work tirelessly towards achieving them. Finally, a persistent person would have the determination to keep pushing forward despite setbacks and obstacles.