योगवासिष्ठः yogavāsiṣṭhaḥ - book-1, chapter-17, verse-51

संस्तीर्णगहना भीमा घनजालरजोमयी ।
सान्धकारोग्रनीहारा तृष्णा विन्ध्यमहातटी ॥ ५१ ॥

saṃstīrṇagahanā bhīmā ghanajālarajomayī ,
sāndhakārogranīhārā tṛṣṇā vindhyamahātaṭī 51

51. saṃstīrṇagahanā bhīmā ghanajālarajomayī
sāndhakārā ugranīhārā tṛṣṇā vindhyamahātaṭī

51. Craving (tṛṣṇā) is like a great cliff of the Vindhya mountains (vindhyamahātaṭī): it is terrifying, with widespread dense thickets, filled with dust from dense formations (of clouds or tangled growth), shrouded in darkness, and beset by formidable mist.

Words meanings summery:

• संस्तीर्णगहना (saṁstīrṇagahanā) - with widespread dense thickets (having widespread dense thickets, covered with dense wilderness)

• भीमा (bhīmā) - terrifying (terrifying, dreadful, fearful)

• घनजालरजोमयी (ghanajālarajomayī) - filled with dust from dense formations (of clouds or tangled growth) (full of dust/pollen from dense networks/clouds/cobwebs)

• सान्धकारा (sāndhakārā) - shrouded in darkness (with darkness, dark, enveloped in darkness)

• उग्रनीहारा (ugranīhārā) - beset by formidable mist (having terrible mist, with formidable fog)

• तृष्णा (tṛṣṇā) - craving (tṛṣṇā) (craving, thirst, desire)

• विन्ध्यमहातटी (vindhyamahātaṭī) - great cliff of the Vindhya mountains (vindhyamahātaṭī) (the great cliff/bank of the Vindhya mountains)

Words meanings and morphology

संस्तीर्णगहना (saṁstīrṇagahanā) - with widespread dense thickets (having widespread dense thickets, covered with dense wilderness)

(adjective)

Nominative, feminine, singular of saṃstīrṇagahana

saṁstīrṇagahana - having widespread dense thickets

Bahuvrīhi compound saṃstīrṇa (spread out) + gahana (dense thicket/wilderness)

Compound type : bahuvrīhi (saṃstīrṇa+gahana)

• saṃstīrṇa – spread out, strewn, covered
  adjective (masculine)
  Past Passive Participle
  From sam (together) + √stṛ (to spread)
  Prefix: sam
  Root: √stṛ (class 9)
• gahana – dense, deep, impenetrable, thicket, wilderness
  noun (neuter)

Note: Describes tṛṣṇā.

भीमा (bhīmā) - terrifying (terrifying, dreadful, fearful)

(adjective)

Nominative, feminine, singular of bhīma

bhīma - dreadful, terrible, formidable, awful

From √bhī (to fear)

Root: √bhī (class 3)

Note: Describes tṛṣṇā.

घनजालरजोमयी (ghanajālarajomayī) - filled with dust from dense formations (of clouds or tangled growth) (full of dust/pollen from dense networks/clouds/cobwebs)

(adjective)

Nominative, feminine, singular of ghanajālarajomaya

ghanajālarajomaya - consisting of dust/pollen from dense networks/clouds

Bahuvrīhi compound ghana (dense) + jāla (net, network) + rajas (dust) + maya (made of, full of).

Compound type : bahuvrīhi (ghana+jāla+rajas+maya)

• ghana – dense, thick, cloud, mass
  adjective/noun (masculine)
• jāla – net, network, web, multitude
  noun (neuter)
• rajas – dust, pollen, passion, impurity
  noun (neuter)
• maya – made of, full of, consisting of
  suffix (masculine)
  Suffix forming adjectives of composition or abundance.

Note: Describes tṛṣṇā.

सान्धकारा (sāndhakārā) - shrouded in darkness (with darkness, dark, enveloped in darkness)

(adjective)

Nominative, feminine, singular of sāndhakāra

sāndhakāra - accompanied by darkness, dark

Bahuvrīhi compound sa (with) + andhakāra (darkness)

Compound type : bahuvrīhi (sa+andhakāra)

• sa – with, accompanied by, together
  prefix
• andhakāra – darkness, gloom
  noun (masculine)

Note: Describes tṛṣṇā.

उग्रनीहारा (ugranīhārā) - beset by formidable mist (having terrible mist, with formidable fog)

(adjective)

Nominative, feminine, singular of ugranīhāra

ugranīhāra - having terrible mist/fog

Bahuvrīhi compound ugra (terrible) + nīhāra (mist)

Compound type : bahuvrīhi (ugra+nīhāra)

• ugra – terrible, formidable, fierce, mighty
  adjective (masculine)
• nīhāra – mist, fog, frost
  noun (masculine)

Note: Describes tṛṣṇā.

तृष्णा (tṛṣṇā) - craving (tṛṣṇā) (craving, thirst, desire)

(noun)

Nominative, feminine, singular of tṛṣṇā

tṛṣṇā - thirst, craving, desire, appetite

From √tṛṣ (to thirst, desire)

Root: √tṛṣ (class 4)

Note: The subject of the simile.

विन्ध्यमहातटी (vindhyamahātaṭī) - great cliff of the Vindhya mountains (vindhyamahātaṭī) (the great cliff/bank of the Vindhya mountains)

(noun)

Nominative, feminine, singular of vindhyamahātaṭī

vindhyamahātaṭī - great cliff/bank of the Vindhya mountains

Tatpurusha compound vindhya (Vindhya mountains) + mahā (great) + taṭī (cliff/bank)

Compound type : tatpuruṣa (vindhya+mahā+taṭī)

• vindhya – Vindhya (mountain range in India)
  proper noun (masculine)
• mahā – great, large, mighty
  adjective
  Stem form of mahat (great)
• taṭī – cliff, bank, shore, edge
  noun (feminine)

Note: The object of comparison.