योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-64, verse-18

क्वचित्पातालगम्भीरगुहाकुम्भाण्डभीषणः ।
क्वचिन्नन्दनसोदर्यमुन्याश्रममनोरमः ॥ १८ ॥

kvacitpātālagambhīraguhākumbhāṇḍabhīṣaṇaḥ ,
kvacinnandanasodaryamunyāśramamanoramaḥ 18

18. kvacit pātālagambhīraguhākumbhāṇḍabhīṣaṇaḥ
kvacit nandanasaudaryamunyāśramamanoramaḥ

18. kvacit pātālagambhīraguhākumbhāṇḍabhīṣaṇaḥ
kvacit nandanasaudaryamunyāśramamanoramaḥ

18. Sometimes, it is terrifying with deep caves reminiscent of the netherworld, inhabited by dreadful pot-bellied demons (kumbhāṇḍas). And sometimes, it is charming with the hermitages (āśramas) of sages (munis), beautiful like Nandanavana.

Words meanings summery:

• क्वचित् (kvacit) - sometimes, somewhere, in some place

• पातालगम्भीरगुहाकुम्भाण्डभीषणः (pātālagambhīraguhākumbhāṇḍabhīṣaṇaḥ) - terrifying with deep caves like the netherworld and pot-bellied demons (kumbhāṇḍas)

• क्वचित् (kvacit) - sometimes, somewhere, in some place

• नन्दनसौदर्यमुन्याश्रममनोरमः (nandanasaudaryamunyāśramamanoramaḥ) - charming with hermitages (āśramas) of sages (munis) akin to Nandanavana

Words meanings and morphology

क्वचित् (kvacit) - sometimes, somewhere, in some place

(indeclinable)

पातालगम्भीरगुहाकुम्भाण्डभीषणः (pātālagambhīraguhākumbhāṇḍabhīṣaṇaḥ) - terrifying with deep caves like the netherworld and pot-bellied demons (kumbhāṇḍas)

(adjective)

Nominative, masculine, singular of pātālagambhīraguhākumbhāṇḍabhīṣaṇa

pātālagambhīraguhākumbhāṇḍabhīṣaṇa - terrifying due to deep caves (like) the netherworld and Kumbhāṇḍa demons

compound adjective

Compound type : bahuvrihi (pātāla+gambhīra+guhā+kumbhāṇḍa+bhīṣaṇa)

• pātāla – the netherworld, subterranean regions
  noun (neuter)
• gambhīra – deep, profound, serious
  adjective (neuter)
• guhā – cave, cavern
  noun (feminine)
  Root: guh (class 1)
• kumbhāṇḍa – a type of demon, a pot-bellied goblin
  noun (masculine)
  compound of kumbha (pot) + āṇḍa (egg, testicle)
• bhīṣaṇa – terrifying, dreadful, formidable
  adjective (masculine)
  from root bhī (to fear)
  Root: bhī (class 3)

Note: Acts as an adjective describing the place.

क्वचित् (kvacit) - sometimes, somewhere, in some place

(indeclinable)

नन्दनसौदर्यमुन्याश्रममनोरमः (nandanasaudaryamunyāśramamanoramaḥ) - charming with hermitages (āśramas) of sages (munis) akin to Nandanavana

(adjective)

Nominative, masculine, singular of nandanasaudaryamunyāśramamanorama

nandanasaudaryamunyāśramamanorama - charming with hermitages of sages akin to Nandanavana

compound adjective

Compound type : bahuvrihi (nandana+saudarya+muni+āśrama+manorama)

• nandana – Nandana (Indra's celestial garden); delighting, gladdening
  proper noun (neuter)
  Root: nand (class 1)
• saudarya – beauty, elegance; akin to, similar (derived from sodara 'sibling')
  adjective (neuter)
  from sodara (from sa-udara 'of the same womb')
• muni – sage, ascetic, silent one
  noun (masculine)
• āśrama – hermitage, abode of ascetics, stage of life
  noun (masculine)
  from ā-śram (to exert oneself)
  Prefix: ā
  Root: śram (class 4)
• manorama – charming, beautiful, delightful, pleasing to the mind
  adjective (masculine)
  compound of manas (mind) + rama (pleasing)
  Root: ram (class 1)

Note: Acts as an adjective describing the place.