योगवासिष्ठः yogavāsiṣṭhaḥ - book-1, chapter-13, verse-12

एषा हि विषमा दुःखभोगिनां गहना गुहा ।
घनमोहगजेन्द्राणां विन्ध्यशैलमहातटी ॥ १२ ॥

eṣā hi viṣamā duḥkhabhogināṃ gahanā guhā ,
ghanamohagajendrāṇāṃ vindhyaśailamahātaṭī 12

12. eṣā hi viṣamā duḥkhabhoginām gahanā guhā
ghanamohagajendrāṇām vindhyaśailamahātaṭī

12. Indeed, this is a formidable and impenetrable cavern for those who endure suffering. It is like the vast, perilous slopes of the Vindhya mountain range for mighty elephants blinded by dense delusion.

Words meanings summery:

• एषा (eṣā) - this (referring to an unstated feminine concept, e.g., illusion, worldly existence) (this, this one)

• हि (hi) - indeed (indeed, certainly, because, for)

• विषमा (viṣamā) - formidable, difficult (uneven, difficult, terrible, formidable)

• दुःखभोगिनाम् (duḥkhabhoginām) - of those who endure suffering (of those who experience suffering, of sufferers)

• गहना (gahanā) - impenetrable (deep, dense, impenetrable, difficult)

• गुहा (guhā) - cavern (cave, cavern, hiding place)

• घनमोहगजेन्द्राणाम् (ghanamohagajendrāṇām) - of mighty elephants blinded by dense delusion (of the mighty elephants of dense delusion)

• विन्ध्यशैलमहातटी (vindhyaśailamahātaṭī) - the vast, perilous slopes of the Vindhya mountain range (the great mountain slope of the Vindhya mountains)

Words meanings and morphology

एषा (eṣā) - this (referring to an unstated feminine concept, e.g., illusion, worldly existence) (this, this one)

(pronoun)

Nominative, feminine, singular of etad

etad - this, that

Demonstrative pronoun

हि (hi) - indeed (indeed, certainly, because, for)

(indeclinable)

विषमा (viṣamā) - formidable, difficult (uneven, difficult, terrible, formidable)

(adjective)

Nominative, feminine, singular of viṣama

viṣama - uneven, difficult, dangerous, terrible

Compound from `vi` (different, bad) and `sama` (even)

Compound type : karmadhāraya (vi+sama)

• vi – prefix meaning separation, adverse, intensive
  indeclinable
  Upasarga
• sama – equal, even, level
  adjective (masculine)

Note: Qualifies `guhā` and `mahātaṭī`.

दुःखभोगिनाम् (duḥkhabhoginām) - of those who endure suffering (of those who experience suffering, of sufferers)

(noun)

Genitive, masculine, plural of duḥkhabhogin

duḥkhabhogin - one who experiences suffering, a sufferer

Compound of `duḥkha` (suffering) and `bhogin` (one who enjoys/experiences)

Compound type : tatpuruṣa (duḥkha+bhogin)

• duḥkha – suffering, misery, pain
  noun (neuter)
• bhogin – one who enjoys, experiences, possesses
  adjective (masculine)
  Agent noun
  Derived from root bhuj (to enjoy, experience) + -in pratyaya
  Root: bhuj (class 7)

गहना (gahanā) - impenetrable (deep, dense, impenetrable, difficult)

(adjective)

Nominative, feminine, singular of gahana

gahana - deep, dense, impenetrable

Root: gah (class 1)

Note: Qualifies `guhā`.

गुहा (guhā) - cavern (cave, cavern, hiding place)

(noun)

Nominative, feminine, singular of guhā

guhā - cave, cavern, hiding place

Derived from root guh (to hide)

Root: guh (class 1)

घनमोहगजेन्द्राणाम् (ghanamohagajendrāṇām) - of mighty elephants blinded by dense delusion (of the mighty elephants of dense delusion)

(noun)

Genitive, masculine, plural of ghanamohagajendra

ghanamohagajendra - mighty elephant of dense delusion

Tatpuruṣa compound of `ghana-moha` (dense delusion) and `gajendra` (mighty elephant). `ghana-moha` is Karmadhāraya.

Compound type : tatpuruṣa (ghanamoha+gajendra)

• ghana – dense, thick, solid
  adjective (masculine)
  Root: han (class 2)
• moha – delusion, infatuation, bewilderment
  noun (masculine)
  Derived from root muh (to be deluded)
  Root: muh (class 4)
• gajendra – mighty elephant, lord of elephants
  noun (masculine)
  Compound of gaja (elephant) and indra (chief/lord)

विन्ध्यशैलमहातटी (vindhyaśailamahātaṭī) - the vast, perilous slopes of the Vindhya mountain range (the great mountain slope of the Vindhya mountains)

(noun)

Nominative, feminine, singular of vindhyaśailamahātaṭī

vindhyaśailamahātaṭī - great slope of the Vindhya mountain

Tatpuruṣa compound: Vindhyaśaila (Vindhya mountain) + Mahātaṭī (great slope). `vindhyaśaila` is Karmadhāraya. `mahātaṭī` is Karmadhāraya.

Compound type : tatpuruṣa (vindhyaśaila+mahātaṭī)

• vindhya – Vindhya (a mountain range in India)
  proper noun (masculine)
• śaila – mountain, hill, rock
  noun (masculine)
• mahā – great, large, mighty
  adjective (feminine)
• taṭī – slope, bank, shore, river bank
  noun (feminine)
  Root: taṭ (class 1)