A person who sometimes exhibits humility and bashfulness is called shy.
As described in the Lalita-mādhava, Kṛṣṇa's shyness was manifested when He lifted Govardhana Hill by the little finger of His left hand. All of the gopīs were observing Kṛṣṇa's wonderful achievement, and Kṛṣṇa was also smiling at seeing the gopīs. When Kṛṣṇa's glance went over the breasts of the gopīs, His hand began to shake, and upon seeing His hand shake, all of the cowherd men underneath the hill became a little disturbed. Then there was a tumultuous roaring sound, and they all began to pray to Kṛṣṇa for safety. At this time Lord Balarāma was smiling, thinking that these cowherd men had been frightened by the shaking of Govardhana Hill. But, seeing Balarāma smile, Kṛṣṇa thought that Balarāma had understood His mind in observing the breasts of the gopīs, and He immediately became bashful.