When, because of self-satisfaction or dislike of excessive labor, a person does not perform his duty in spite of having the energy, he is called lazy. This laziness also is manifest in ecstatic love of Kṛṣṇa. For example, when some brāhmaṇas were requested by Nanda Mahārāj to circumambulate Govardhan Hill, they told him that they were more interested in offering benedictions than in circumambulating Govardhan Hill. This is an instance of laziness caused by self-satisfaction.
Once when Kṛṣṇa, along with His cowherd boy friends, was having a mock battle, Subala showed the symptoms of fatigue. Kṛṣṇa immediately told His other friends: "Subala is feeling too fatigued from mock-fighting with Me. So please do not disturb him anymore by inviting him to fight." This is an instance of laziness caused by dislike of excessive labor.
Inertness
In the Tenth Canto, 21st Chapter, 13th verse of Śrīmad-Bhāgavatam there is an appreciation by the gopīs of the inertia of the cows in Vṛndāvana. The gopīs saw that the cows were hearing the sweet songs vibrated by Kṛṣṇa's flute and were appearing to be drinking the nectar of these transcendental sounds. The calves were stunned, and they forgot to drink the milk from the milk bags. Their eyes seemed to be embracing Kṛṣṇa, and there were tears in their eyes. This is an instance of inertia resulting from hearing the transcendental vibrations of Kṛṣṇa's flute.
When Lakṣmaṇa became disturbed upon hearing words against Kṛṣṇa, she remained inert and did not move her eyelids. This is another example of inertia caused by hearing.