योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-50, verse-59

जरामरणदुःखेन व्यर्थमुन्नतिमीयुषा ।
दोषाशीविषकोशेन चेतो गच्छति पीनताम् ॥ ५९ ॥

jarāmaraṇaduḥkhena vyarthamunnatimīyuṣā ,
doṣāśīviṣakośena ceto gacchati pīnatām 59

59. jarāmaraṇaduḥkhena vyartham unnatim īyuṣā
doṣāśīviṣakośena cetaḥ gacchati pīnatām

59. jarāmaraṇaduḥkhena vyartham unnatim īyuṣā
doṣāśīviṣakośena cetaḥ pīnatām gacchati

59. Through the sorrow of old age and death, and by the sheath of venomous snake-like faults (doṣa) that has gained pointless prominence, the mind becomes engrossed.

Words meanings summery:

• जरामरणदुःखेन (jarāmaraṇaduḥkhena) - by the sorrow of old age and death

• व्यर्थम् (vyartham) - uselessly, in vain, for no purpose

• उन्नतिम् (unnatim) - prominence, rise, growth, elevation

• ईयुषा (īyuṣā) - by one who has attained/gone, by that which has attained

• दोषाशीविषकोशेन (doṣāśīviṣakośena) - by the sheath of venomous snake-like faults

• चेतः (cetaḥ) - the mind

• गच्छति (gacchati) - goes, becomes, attains

• पीनताम् (pīnatām) - fatness, grossness, engrossment

Words meanings and morphology

जरामरणदुःखेन (jarāmaraṇaduḥkhena) - by the sorrow of old age and death

(noun)

Instrumental, neuter, singular of jarāmaraṇaduḥkha

jarāmaraṇaduḥkha - sorrow of old age and death

Compound type : tatpuruṣa (jarā+maraṇa+duḥkha)

• jarā – old age
  noun (feminine)
• maraṇa – death
  noun (neuter)
• duḥkha – sorrow, suffering, pain
  noun (neuter)

व्यर्थम् (vyartham) - uselessly, in vain, for no purpose

(indeclinable)

Note: Used adverbially here.

उन्नतिम् (unnatim) - prominence, rise, growth, elevation

(noun)

Accusative, feminine, singular of unnati

unnati - rise, elevation, progress, prosperity, prominence

ईयुषा (īyuṣā) - by one who has attained/gone, by that which has attained

(adjective)

Instrumental, masculine, singular of īyuṣ

īyuṣ - one who has gone or attained

Past Active Participle

Derived from root 'i' (to go) with kvasu suffix.

Root: i (class 2)

दोषाशीविषकोशेन (doṣāśīviṣakośena) - by the sheath of venomous snake-like faults

(noun)

Instrumental, masculine, singular of doṣāśīviṣakośa

doṣāśīviṣakośa - sheath of fault-snakes, sheath of faults like venomous snakes

Compound type : tatpuruṣa (doṣa+āśīviṣa+kośa)

• doṣa – fault, vice, defect
  noun (masculine)
• āśīviṣa – venomous snake
  noun (masculine)
• kośa – sheath, treasury, bud
  noun (masculine)

चेतः (cetaḥ) - the mind

(noun)

Nominative, neuter, singular of cetas

cetas - mind, intellect, heart

गच्छति (gacchati) - goes, becomes, attains

(verb)

3rd person , singular, active, present indicative (laṭ) of gam

Root: gam (class 1)

पीनताम् (pīnatām) - fatness, grossness, engrossment

(noun)

Accusative, feminine, singular of pīnatā

pīnatā - fatness, stoutness, grossness, fullness