• puruṣa - ṛṣabha — bull of men
  Compound: puruṣa + ṛṣabha (bull, chief). Cf. verse 17 — the same epithet Śuka used for Parīkṣit. The Bhāgavatam grants the title equally — Kaṁsa is a bull among men, Parīkṣit also; the same word inhabits opposite ethics.
• virahitā — bereft
  Past participle of vi + √rah — to leave, abandon. The widow-word. Cf. the gopīs' viraha for Kṛṣṇa after His departure for Mathurā (the very next chapters). The Bhāgavatam uses the same viraha-vocabulary for both — the city of Mathurā in viraha for Kaṁsa, the gopīs of Vraja in viraha for Kṛṣṇa. Same word, different rasa.
• nivṛtta - utsava - maṅgalā — with festivities and auspiciousness ceased
  Compound: nivṛtta (turned-away) + utsava (festival) + maṅgala (auspiciousness). The Bhāgavatam pictures the city's joy as 'turned away' — utsava is not destroyed, just absent. It is waiting to return in another form.
• purī — the city
  From √pṝ (to fill, fortify). The same word that names Mathurā-purī. The Bhāgavatam personifies the city as a woman — like the widows, the purī is in mourning. The next chapters will show her finding new utsava under Kṛṣṇa's coronation of Ugrasena.

• Whose departure once felt like the end of festivity but later proved the start of one?
• Where are you mourning the end of a 'festival' that was always toxic?

Without you, the city itself has lost its beauty — its festivals, its good fortune, all gone. The widows describe Mathurā as widowed; the queen-consort and the queen-city share the bereavement. The Bhāgavatam, with the gentlest touch, names the cost of demoniac rule: when the tyrant goes, the city's habituated joy goes too. It will have to learn a new joy.