CC Madhya-lila 14.174 - Ujjvala-nilamani
Sri Caitanya-caritamrta
CC Madhya-lila
CC Madhya 14.173, Purport:
Rādhārāṇī’s shyness arises due to Śrī Kṛṣṇa's prohibitions, and ecstatic loving bodily symptoms called kila-kiñcita-bhāva are manifest at this time. These ecstatic symptoms are explained in the following verse, which is from Śrīla Rūpa Gosvāmī’s Ujjvala-nīlamaṇi (Anubhāva-prakaraṇa 39).
CC Madhya 14.174, Translation:
“"Pride, ambition, weeping, smiling, envy, fear and anger are the seven ecstatic loving symptoms manifested by a jubilant shrinking away, and these symptoms are called kila-kiñcita-bhāva."