योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-126, verse-21

संसारनिन्दकैस्तद्वद्वैराग्यकरणक्रमैः ।
शिलाशय्यासमासीनो जरयत्यायुराततम् ॥ २१ ॥

saṃsāranindakaistadvadvairāgyakaraṇakramaiḥ ,
śilāśayyāsamāsīno jarayatyāyurātatam 21

21. saṃsāranindakaiḥ tadvat vairāgyakaraṇakramaiḥ
śilāśayyāsamāsīnaḥ jarayati āyuḥ ātatam

21. śilāśayyāsamāsīnaḥ saṃsāranindakaiḥ tadvat
vairāgyakaraṇakramaiḥ ātatam āyuḥ jarayati

21. As well as through methods that cultivate dispassion (vairāgya) (as advocated) by those who decry worldly existence (saṃsāra), such a person, seated on a stone bed, spends their long life.

Words meanings summery:

• संसारनिन्दकैः (saṁsāranindakaiḥ) - by those who censure or deprecate worldly existence (saṃsāra)

• तद्वत् (tadvat) - similarly, likewise, in that manner

• वैराग्यकरणक्रमैः (vairāgyakaraṇakramaiḥ) - by means of methods for cultivating dispassion (vairāgya)

• शिलाशय्यासमासीनः (śilāśayyāsamāsīnaḥ) - seated on a stone bed

• जरयति (jarayati) - he causes to decay, he wastes away, he spends (time)

• आयुः (āyuḥ) - life, lifespan

• आततम् (ātatam) - extended, long, vast

Words meanings and morphology

संसारनिन्दकैः (saṁsāranindakaiḥ) - by those who censure or deprecate worldly existence (saṃsāra)

(noun)

Instrumental, masculine, plural of saṃsāranindaka

saṁsāranindaka - one who deprecates or condemns worldly existence (saṃsāra)

Compound type : tatpuruṣa (saṃsāra+nindaka)

• saṃsāra – cycle of rebirth, worldly existence, transmigration
  noun (masculine)
• nindaka – censor, blamer, one who deprecates
  noun (masculine)
  Derived from verb root nid-
  Root: nid (class 1)

तद्वत् (tadvat) - similarly, likewise, in that manner

(indeclinable)

वैराग्यकरणक्रमैः (vairāgyakaraṇakramaiḥ) - by means of methods for cultivating dispassion (vairāgya)

(noun)

Instrumental, masculine, plural of vairāgyakaraṇakrama

vairāgyakaraṇakrama - methods for generating dispassion (vairāgya)

Compound type : tatpuruṣa (vairāgya+karaṇa+krama)

• vairāgya – dispassion, detachment, indifference
  noun (neuter)
  Derived from virāga (absence of passion)
• karaṇa – causing, making, instrument, means
  noun (neuter)
  action noun
  Derived from verb root kṛ-
  Root: kṛ (class 8)
• krama – sequence, order, method, practice
  noun (masculine)

शिलाशय्यासमासीनः (śilāśayyāsamāsīnaḥ) - seated on a stone bed

(adjective)

Nominative, masculine, singular of śilāśayyāsamāsīna

śilāśayyāsamāsīna - one seated on a stone bed

Compound type : bahuvrīhi (śilāśayyā+samāsīna)

• śilāśayyā – stone bed
  noun (feminine)
• śilā – stone, rock
  noun (feminine)
• śayyā – bed, couch, lying down
  noun (feminine)
  Derived from verb root śī-
  Root: śī (class 2)
• samāsīna – seated, sitting together, settled
  adjective (masculine)
  Past Active Participle
  Derived from verb root ās- with prefixes sam- and ā-
  Prefixes: sam+ā
  Root: ās (class 2)

जरयति (jarayati) - he causes to decay, he wastes away, he spends (time)

(verb)

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

Causative

Causative form of verb root jṛ-

Root: jṛ (class 1)

आयुः (āyuḥ) - life, lifespan

(noun)

Accusative, neuter, singular of āyus

āyus - life, vital power, duration of life

आततम् (ātatam) - extended, long, vast

(adjective)

Accusative, neuter, singular of ātata

ātata - extended, stretched, wide, long

Past Passive Participle

Derived from verb root tan- with prefix ā-

Prefix: ā

Root: tan (class 8)