• sapta — seven
  The number to remember through the rest of the episode. Seven bulls; seven Kṛṣṇas (verse 45). Gauḍīya: when Bhagavān must answer a sevenfold problem He generates a sevenfold solution; the asymmetry vanishes.
• go - vṛṣān — bulls
  Compound go (cow) + vṛṣa (bull). Tīrtha-vṛṣa or simply vṛṣa — bulls. Gauḍīya note: Kṛṣṇa is gopāla, master of cows; the bulls of His future father-in-law are kin to His own herd. Subduing them is a family gesture.
• durdharṣān — unbreakable
  From dur (difficult) + √dharṣ — hard to overpower. The bulls are the visible image of every barrier worldly suitors face. Gauḍīya: difficulty is reserved by Bhagavān for His own showcase.
• vīrya - gandha - asahān — unable to bear the scent of valour
  Compound — they cannot tolerate the smell of warriors. A near-impossible condition: even a brave smell defeats them. Gauḍīya: the test is rigged against ordinary heroism. Only Bhagavān's līlā-strength will pass.

A bride-condition that no king has met is not a barrier but an invitation — held in reserve for the one who will not merely meet it but multiply Himself to meet it. The seven bulls are waiting for the seven Kṛṣṇas.