महाभारतः mahābhārataḥ - book-3, chapter-80, verse-21

तं दृष्ट्वा नियमेनाथ स्वाध्यायाम्नायकर्शितम् ।
भीष्मं कुरुकुलश्रेष्ठं मुनिः प्रीतमनाभवत् ॥२१॥

21. taṁ dṛṣṭvā niyamenātha svādhyāyāmnāyakarśitam ,
bhīṣmaṁ kurukulaśreṣṭhaṁ muniḥ prītamanābhavat.

21. tam dṛṣṭvā niyamena atha svādhyāyāmnāyakarśitam
bhīṣmam kurukulaśreṣṭham muniḥ prītamanāḥ abhavat

21. Seeing Bhishma, the best of the Kuru lineage, emaciated by his disciplined practices and devotion to self-study and sacred tradition, the sage became pleased in mind.

Words meanings summery:

• तम् (tam) - him, that

• दृष्ट्वा (dṛṣṭvā) - having seen

• नियमेन (niyamena) - by discipline, by rule, by self-restraint

• अथ (atha) - then, and then, moreover

• स्वाध्यायाम्नायकर्शितम् (svādhyāyāmnāyakarśitam) - emaciated by self-study and traditional knowledge

• भीष्मम् (bhīṣmam) - Bhishma

• कुरुकुलश्रेष्ठम् (kurukulaśreṣṭham) - the best of the Kuru family

• मुनिः (muniḥ) - The sage Pulastya (sage, ascetic, silent one)

• प्रीतमनाः (prītamanāḥ) - pleased in mind, joyful

• अभवत् (abhavat) - became, was

Words meanings and morphology

तम् (tam) - him, that

(pronoun)

Accusative, masculine, singular of tad

tad - that

दृष्ट्वा (dṛṣṭvā) - having seen

(indeclinable)

Absolutive

formed with suffix -tvā

Root: dṛś (class 1)

नियमेन (niyamena) - by discipline, by rule, by self-restraint

(noun)

Instrumental, masculine, singular of niyama

niyama - discipline, rule, self-restraint

Prefix: ni

Root: yam (class 1)

अथ (atha) - then, and then, moreover

(indeclinable)

स्वाध्यायाम्नायकर्शितम् (svādhyāyāmnāyakarśitam) - emaciated by self-study and traditional knowledge

(adjective)

Accusative, masculine, singular of svādhyāyāmnāyakarśita

svādhyāyāmnāyakarśita - emaciated by self-study and traditional knowledge/scriptures

Compound type : tatpuruṣa (svādhyāya+āmnāya+karśita)

• svādhyāya – self-study, recitation of Vedic texts
  noun (masculine)
  Prefix: sva
  Root: adhyāy
• āmnāya – traditional knowledge, sacred tradition, scriptures
  noun (masculine)
  Prefix: ā
  Root: mnā (class 2)
• karśita – emaciated, weakened, worn out
  adjective (masculine)
  Past Passive Participle
  from root kṛś + kta
  Root: kṛś (class 1)

Note: Qualifies Bhishma.

भीष्मम् (bhīṣmam) - Bhishma

(proper noun)

Accusative, masculine, singular of bhīṣma

bhīṣma - Bhishma (proper name), formidable, dreadful

Root: bhī (class 3)

कुरुकुलश्रेष्ठम् (kurukulaśreṣṭham) - the best of the Kuru family

(adjective)

Accusative, masculine, singular of kurukulaśreṣṭha

kurukulaśreṣṭha - best of the Kuru lineage

Compound type : tatpuruṣa (kuru+kula+śreṣṭha)

• kuru – Kuru (name of an ancient king and his dynasty)
  proper noun (masculine)
• kula – family, lineage, clan
  noun (neuter)
• śreṣṭha – best, most excellent
  adjective (masculine)
  superlative of praśasya/praśasta
  Root: praśas

Note: Qualifies Bhishma.

मुनिः (muniḥ) - The sage Pulastya (sage, ascetic, silent one)

(noun)

Nominative, masculine, singular of muni

muni - sage, ascetic, silent one

Root: man (class 4)

Note: Refers to Pulastya.

प्रीतमनाः (prītamanāḥ) - pleased in mind, joyful

(adjective)

Nominative, masculine, singular of prītamanas

prītamanas - pleased in mind, joyful

Compound type : bahuvrīhi (prīta+manas)

• prīta – pleased, satisfied, loved
  adjective (masculine)
  Past Passive Participle
  from root prī + kta
  Root: prī (class 9)
• manas – mind, intellect, heart
  noun (neuter)
  Root: man (class 4)

Note: Qualifies muniḥ.

अभवत् (abhavat) - became, was

(verb)

3rd person , singular, active, Past Imperfect (laṅ) of bhū

Root: bhū (class 1)