महाभारतः mahābhārataḥ - book-12, chapter-318, verse-21

शीर्णं परशरीरेण निच्छवीकं शरीरिणम् ।
प्राणिनां प्राणसंरोधे मांसश्लेष्मविचेष्टितम् ॥२१॥

21. śīrṇaṁ paraśarīreṇa nicchavīkaṁ śarīriṇam ,
prāṇināṁ prāṇasaṁrodhe māṁsaśleṣmaviceṣṭitam.

21. śīrṇam paraśarīreṇa nicchavīkam śarīriṇam
prāṇinām prāṇasaṃrodhe māṃsaśleṣmaviceṣṭitam

21. prāṇinām prāṇasaṃrodhe (sati) śarīriṇam paraśarīreṇa
śīrṇam nicchavīkam māṃsaśleṣmaviceṣṭitam (bhavati)

21. When the life-breath of living beings ceases, the embodied self (ātman) is seen as decayed by its externalized body, devoid of luster, and reduced to a mere activity of flesh and phlegm.

Words meanings summery:

• शीर्णम् (śīrṇam) - decayed, wasted

• परशरीरेण (paraśarīreṇa) - by the external body

• निच्छवीकम् (nicchavīkam) - lacking vitality, lifeless (devoid of luster, pale)

• शरीरिणम् (śarīriṇam) - the embodied self (ātman) (the embodied one, the soul)

• प्राणिनाम् (prāṇinām) - of living beings

• प्राणसंरोधे (prāṇasaṁrodhe) - in the cessation of breath/life

• मांसश्लेष्मविचेष्टितम् (māṁsaśleṣmaviceṣṭitam) - a mere activity/mass of flesh and phlegm

Words meanings and morphology

शीर्णम् (śīrṇam) - decayed, wasted

(adjective)

Accusative, neuter, singular of śīrṇa

śīrṇa - decayed, wasted, withered, old

Past Passive Participle

From √śṝ (to decay, to waste away)

Root: śṝ (class 9)

परशरीरेण (paraśarīreṇa) - by the external body

(noun)

Instrumental, neuter, singular of paraśarīra

paraśarīra - another's body, external body

Compound type : tatpurusha (para+śarīra)

• para – other, another, external
  adjective
• śarīra – body
  noun (neuter)

निच्छवीकम् (nicchavīkam) - lacking vitality, lifeless (devoid of luster, pale)

(adjective)

Accusative, neuter, singular of nicchavīka

nicchavīka - devoid of luster, pale, lifeless

From ni- (privative) + chavi (luster, beauty) + -ka

शरीरिणम् (śarīriṇam) - the embodied self (ātman) (the embodied one, the soul)

(noun)

Accusative, masculine, singular of śarīrin

śarīrin - embodied, having a body, soul, living being

प्राणिनाम् (prāṇinām) - of living beings

(noun)

Genitive, masculine, plural of prāṇin

prāṇin - living being, animate creature, one who breathes

प्राणसंरोधे (prāṇasaṁrodhe) - in the cessation of breath/life

(noun)

Locative, masculine, singular of prāṇasaṃrodha

prāṇasaṁrodha - cessation of breath, obstruction of life-breath

Compound type : tatpurusha (prāṇa+saṃrodha)

• prāṇa – breath, life-force, vital air
  noun (masculine)
• saṃrodha – obstruction, suppression, cessation, restraint
  noun (masculine)
  From √rudh (to obstruct) with sam-
  Prefix: sam
  Root: rudh (class 7)

मांसश्लेष्मविचेष्टितम् (māṁsaśleṣmaviceṣṭitam) - a mere activity/mass of flesh and phlegm

(noun)

Accusative, neuter, singular of māṃsaśleṣmaviceṣṭita

māṁsaśleṣmaviceṣṭita - activity of flesh and phlegm; that which is characterized by flesh and phlegm

Compound type : dvandva (māṃsa+śleṣman+viceṣṭita)

• māṃsa – flesh, meat
  noun (neuter)
• śleṣman – phlegm, mucus
  noun (masculine)
• viceṣṭita – activity, movement, action; exertion
  noun (neuter)
  From √ceṣṭ (to move) with vi-
  Prefix: vi
  Root: ceṣṭ (class 1)