No, Buddhism does not promote or justify laziness. In fact, the Buddha's teachings emphasize the importance of cultivating diligence, discipline, and a proactive approach to life.
Buddhism encourages its followers to follow the Noble Eightfold Path, which includes Right Effort as one of its components. Right Effort involves making a sustained effort to abandon unwholesome qualities, cultivate wholesome qualities, and maintain and strengthen wholesome qualities. This means actively working towards self-improvement, compassion, wisdom, and ethical behavior.
The Buddha taught that one should avoid both extremes of indulgence in sensual pleasures (which could lead to laziness) and extreme asceticism (which could lead to self-harm). The Middle Way is encouraged, where one strikes a balance in life and is mindful of one's actions, thoughts, and emotions.
Buddhism also emphasizes the concept of karma, the law of cause and effect. Laziness can lead to negative consequences in future lives or in this life. The Buddha encouraged his followers to be diligent in their spiritual practice to break free from the cycle of suffering (samsara) and attain liberation (nirvana).
Furthermore, the Buddhist teachings on the Four Noble Truths and the nature of suffering (dukkha) call for an active engagement with the mind and its conditioning to find a path to liberation. Laziness or complacency would hinder one's progress in understanding and transcending suffering.
Overall, Buddhism encourages a diligent and mindful approach to life, promoting active engagement with one's spiritual practice and worldly responsibilities rather than endorsing laziness or idleness.