Any person who neither becomes impudent nor exhibits a puffed-up nature is called gentle.
The example of Kṛṣṇa's gentle behavior was manifested when He was coming to the arena of the Rājasūya sacrifice arranged by Mahārāja Yudhiṣṭhira, Kṛṣṇa's older cousin. Mahārāja Yudhiṣṭhira knew that Kṛṣṇa was the Supreme Personality of Godhead, and he was attempting to get down from his chariot to receive Kṛṣṇa. But before Yudhiṣṭhira could get down, Lord Kṛṣṇa got down from His own chariot and immediately fell at the feet of the King. Even though Kṛṣṇa is the Supreme Personality of Godhead, He never forgets to show social etiquette in His dealings.