योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-24, verse-59

क्वचिदत्यन्तसंशान्तवातादेकान्तनिर्ध्वनि ।
क्वचित्पर्वततुल्याभ्रशिखाकूटशतोदयम् ॥ ५९ ॥

kvacidatyantasaṃśāntavātādekāntanirdhvani ,
kvacitparvatatulyābhraśikhākūṭaśatodayam 59

59. kvacit atyantasaṃśāntavātāt ekāntanirdhvani
kvacit parvatatulyābhraśikhākūṭaśatodayam

59. kvacit atyantasaṃśāntavātāt ekāntanirdhvani,
kvacit parvatatulyābhraśikhākūṭaśatodayam

59. Sometimes, it is utterly silent due to extremely calm winds; and sometimes, it features the rising of hundreds of cloud-peaks resembling mountains.

Words meanings summery:

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

• अत्यन्तसंशान्तवातात् (atyantasaṁśāntavātāt) - due to extremely calm winds (from extremely calm winds)

• एकान्तनिर्ध्वनि (ekāntanirdhvani) - utterly silent (utterly soundless, absolutely quiet)

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

• पर्वततुल्याभ्रशिखाकूटशतोदयम् (parvatatulyābhraśikhākūṭaśatodayam) - features the rising of hundreds of cloud-peaks resembling mountains (having the rising of hundreds of peaks of clouds resembling mountains)

Words meanings and morphology

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

(indeclinable)

अत्यन्तसंशान्तवातात् (atyantasaṁśāntavātāt) - due to extremely calm winds (from extremely calm winds)

(noun)

Ablative, masculine, singular of atyantasaṃśāntavāta

atyantasaṁśāntavāta - extremely calm wind

Tatpurusha compound: atyanta (extreme) + saṃśānta (calm) + vāta (wind)

Compound type : tatpurusha (atyanta+saṃśānta+vāta)

• atyanta – extreme, excessive, very much, utterly
  adjective (neuter)
  Prefix: ati
• saṃśānta – perfectly calm, utterly still, pacified
  adjective (neuter)
  Past Passive Participle
  from saṃ-√śam (to be utterly calm)
  Prefix: sam
  Root: śam (class 4)
• vāta – wind, air
  noun (masculine)
  from √vā (to blow)
  Root: vā (class 2)

Note: The ablative case indicates cause or origin: 'due to'.

एकान्तनिर्ध्वनि (ekāntanirdhvani) - utterly silent (utterly soundless, absolutely quiet)

(adjective)

Accusative, neuter, singular of ekāntanirdhvani

ekāntanirdhvani - absolutely soundless, utterly quiet

Bahuvrihi compound: ekānta (absolute) + nirdhvani (soundless)

Compound type : bahuvrihi (ekānta+nirdhvani)

• ekānta – solitary, exclusive, absolute, very
  adjective (neuter)
  compound: eka (one) + anta (end, limit)
• nirdhvani – soundless, noiseless
  adjective (neuter)
  Bahuvrihi compound: nir (without) + dhvani (sound)
  Prefix: nis

Note: This adjectival form describes the state of being soundless. The final -i indicates i-stem adjective, accusative singular neuter.

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

(indeclinable)

पर्वततुल्याभ्रशिखाकूटशतोदयम् (parvatatulyābhraśikhākūṭaśatodayam) - features the rising of hundreds of cloud-peaks resembling mountains (having the rising of hundreds of peaks of clouds resembling mountains)

(adjective)

Accusative, neuter, singular of parvatatulyābhraśikhākūṭaśatodaya

parvatatulyābhraśikhākūṭaśatodaya - having the appearance of hundreds of masses of cloud-peaks resembling mountains

Bahuvrihi compound

Compound type : bahuvrihi (parvata+tulya+abhra+śikhā+kūṭa+śata+udaya)

• parvata – mountain, hill
  noun (masculine)
• tulya – like, resembling, equal to
  adjective (neuter)
  from √tul (to weigh)
  Root: tul (class 10)
• abhra – cloud, sky
  noun (neuter)
• śikhā – peak, crest, top, flame
  noun (feminine)
• kūṭa – peak, horn, mass, heap, multitude
  noun (neuter)
• śata – hundred
  numeral (neuter)
• udaya – rising, ascent, appearance, prosperity
  noun (masculine)
  from ud-√i (to rise, appear)
  Prefix: ud
  Root: i (class 2)