महाभारतः mahābhārataḥ - book-5, chapter-160, verse-16

अधर्मज्ञो नित्यवैरी पापबुद्धिर्नृशंसकृत् ।
सत्यां प्रतिज्ञां नचिराद्रक्ष्यसे तां सुयोधन ॥१६॥

16. adharmajño nityavairī pāpabuddhirnṛśaṁsakṛt ,
satyāṁ pratijñāṁ nacirādrakṣyase tāṁ suyodhana.

16. adharma-jñaḥ nitya-vairī pāpabuddhiḥ nṛśaṃsakṛt
satyām pratijñām na cirāt rakṣyase tām suyodhana

16. suyodhana adharma-jñaḥ nitya-vairī pāpabuddhiḥ
nṛśaṃsakṛt tām satyām pratijñām cirāt na rakṣyase

16. O Duryodhana, you who are ignorant of natural law (dharma), a perpetual enemy, evil-minded, and cruel-hearted—you will not long protect that true vow (pratijñā).

Words meanings summery:

• अधर्म-ज्ञः (adharma-jñaḥ) - ignorant of natural law (dharma) (referring to Duryodhana) (ignorant of dharma, unrighteous, knowing unrighteousness)

• नित्य-वैरी (nitya-vairī) - perpetual enemy, eternal foe

• पापबुद्धिः (pāpabuddhiḥ) - evil-minded, having evil thoughts

• नृशंसकृत् (nṛśaṁsakṛt) - cruel doer, perpetrator of cruelty

• सत्याम् (satyām) - that true vow (true, truthful)

• प्रतिज्ञाम् (pratijñām) - the vow made by Arjuna and Bhima to defeat Duryodhana and his allies (vow, promise, pledge)

• न (na) - not, no

• चिरात् (cirāt) - not for long (for long, after a long time)

• रक्ष्यसे (rakṣyase) - you will be able to maintain/defend (that vow) (you will protect (for yourself), you will guard, you will maintain)

• ताम् (tām) - that (referring to 'pratijñām') (that, her)

• सुयोधन (suyodhana) - O Duryodhana (addressed as vocative) (O Suyodhana)

Words meanings and morphology

अधर्म-ज्ञः (adharma-jñaḥ) - ignorant of natural law (dharma) (referring to Duryodhana) (ignorant of dharma, unrighteous, knowing unrighteousness)

(adjective)

Nominative, masculine, singular of adharma-jña

adharma-jña - knowing unrighteousness, ignorant of dharma

Compound type : upapada tatpuruṣa (adharma+jña)

• adharma – unrighteousness, unrighteous conduct, impiety
  noun (masculine)
  Negative compound with 'a' and 'dharma'
  Prefix: a
• jña – knowing, acquainted with, wise
  adjective (masculine)
  agent noun/suffix
  Derived from root jñā (to know)
  Root: jñā (class 9)

नित्य-वैरी (nitya-vairī) - perpetual enemy, eternal foe

(adjective)

Nominative, masculine, singular of nitya-vairin

nitya-vairin - having perpetual enmity, constant enemy

Compound type : karmadhāraya (nitya+vairin)

• nitya – constant, perpetual, eternal
  adjective (masculine)
• vairin – enemy, hostile
  noun (masculine)

पापबुद्धिः (pāpabuddhiḥ) - evil-minded, having evil thoughts

(adjective)

Nominative, masculine, singular of pāpabuddhi

pāpabuddhi - having evil thoughts/intellect

Compound type : bahuvrīhi (pāpa+buddhi)

• pāpa – evil, wicked, sinful; sin, evil
  adjective (neuter)
• buddhi – intellect, mind, understanding
  noun (feminine)
  Derived from root budh (to know)
  Root: budh (class 1)

नृशंसकृत् (nṛśaṁsakṛt) - cruel doer, perpetrator of cruelty

(adjective)

Nominative, masculine, singular of nṛśaṃsakṛt

nṛśaṁsakṛt - doing cruel deeds, perpetrator of cruelty

agent noun

Compound ending in 'kṛt' (doer) from root kṛ (to do)

Compound type : upapada tatpuruṣa (nṛśaṃsa+kṛt)

• nṛśaṃsa – cruel, wicked, atrocious
  adjective (masculine)
• kṛt – doing, making, doer, maker
  adjective (masculine)
  suffix/agent noun
  Agent suffix from root kṛ (to do)
  Root: kṛ (class 8)

सत्याम् (satyām) - that true vow (true, truthful)

(adjective)

Accusative, feminine, singular of satya

satya - true, real, truthful, genuine

Note: Modifies 'pratijñām'.

प्रतिज्ञाम् (pratijñām) - the vow made by Arjuna and Bhima to defeat Duryodhana and his allies (vow, promise, pledge)

(noun)

Accusative, feminine, singular of pratijñā

pratijñā - vow, promise, assertion, understanding

Prefix: prati

Root: jñā (class 9)

न (na) - not, no

(indeclinable)

चिरात् (cirāt) - not for long (for long, after a long time)

(indeclinable)

Note: Used adverbially to mean 'for a long time'.

रक्ष्यसे (rakṣyase) - you will be able to maintain/defend (that vow) (you will protect (for yourself), you will guard, you will maintain)

(verb)

2nd person , singular, middle, future (lṛṭ) of rakṣ

Root: rakṣ (class 1)

ताम् (tām) - that (referring to 'pratijñām') (that, her)

(pronoun)

Accusative, feminine, singular of tad

tad - that (demonstrative pronoun)

Note: Modifies 'pratijñām'.

सुयोधन (suyodhana) - O Duryodhana (addressed as vocative) (O Suyodhana)

(proper noun)

Vocative, masculine, singular of suyodhana

suyodhana - Suyodhana (name), good warrior