• samanudhyāyan — meditating
  Sam + anu + √dhyai. Continuous meditation. The same verb used for yogic meditation on Bhagavān is here turned toward Subhadrā — but Gauḍīyas read this with humor, not condemnation: Arjuna's dhyāna on Kṛṣṇa's sister is, structurally, dhyāna inside Kṛṣṇa's family.
• antaram — the right opportunity
  From antar (interval, gap). The gap-in-time that the kidnap will need. Bhagavān arranges antaras for His devotees — the right gap in the right festival, sanctioned by parents and by Kṛṣṇa, so even an abduction becomes lawful līlā.
• kāmena — due to lust
  Instrumental of kāma. The Bhāgavatam does not pretend Arjuna is desireless — Gauḍīyas read this honesty as proof that bhakti does not require pretending. The kāma is named, and in v. 9 Kṛṣṇa sanctions its lawful fulfillment.
• ati-balīyasā — most strong
  Comparative of balin (strong) intensified by ati. Kāma is named bala — a force. Gauḍīyas note that only one bala is greater: kṛṣṇa-prema, which is the only true conqueror of kāma (CC Madhya 19.176).

Arjuna cannot sleep — the same Arjuna who, on Kurukṣetra's edge, sat down in the chariot and asked Kṛṣṇa to drive. The hero of the Gītā is here as restless as any householder in love. Kṛṣṇa's friends are not statues; they are persons whose hearts shake.