महाभारतः mahābhārataḥ - book-3, chapter-181, verse-12

अमोघबलसंकल्पाः सुव्रताः सत्यवादिनः ।
ब्रह्मभूता नराः पुण्याः पुराणाः कुरुनन्दन ॥१२॥

12. amoghabalasaṁkalpāḥ suvratāḥ satyavādinaḥ ,
brahmabhūtā narāḥ puṇyāḥ purāṇāḥ kurunandana.

12. amoghabalasaṅkalpāḥ suvratāḥ satyavādinaḥ |
brahmabhūtā narāḥ puṇyāḥ purāṇāḥ kurunandana

12. O descendant of Kuru (Kurunandana), these virtuous, ancient people are those whose resolves are of unfailing power, who observe excellent vows, who speak the truth, and who have become one with Brahman (brahman).

Words meanings summery:

• अमोघबलसङ्कल्पाः (amoghabalasaṅkalpāḥ) - (people) whose resolves have unfailing power (whose resolutions have unfailing power, whose will is irresistible)

• सुव्रताः (suvratāḥ) - (people) who observe excellent vows (of excellent vows, virtuous, pious, observing good conduct)

• सत्यवादिनः (satyavādinaḥ) - (people) who speak the truth (truth-speakers, truthful)

• ब्रह्मभूता (brahmabhūtā) - (people) who have become one with Brahman (brahman) (become Brahman, attained to Brahman, identified with Brahman)

• नराः (narāḥ) - people (men, people)

• पुण्याः (puṇyāḥ) - virtuous (people) (virtuous, righteous, holy, meritorious)

• पुराणाः (purāṇāḥ) - ancient (people) (ancient, old, primeval)

• कुरुनन्दन (kurunandana) - O descendant of Kuru (a vocative address) (O delight of the Kurus, O son of Kuru)

Words meanings and morphology

अमोघबलसङ्कल्पाः (amoghabalasaṅkalpāḥ) - (people) whose resolves have unfailing power (whose resolutions have unfailing power, whose will is irresistible)

(adjective)

Nominative, masculine, plural of amoghabalasaṅkalpa

amoghabalasaṅkalpa - having unfailing power of will or resolve

Compound type : bahuvrīhi (amogha+bala+saṅkalpa)

• amogha – unfailing, infallible, effective, unerring
  adjective
• bala – strength, power, force
  noun (neuter)
• saṅkalpa – resolve, intention, will, solemn vow
  noun (masculine)
  Prefix: sam

Note: Nominative plural masculine.

सुव्रताः (suvratāḥ) - (people) who observe excellent vows (of excellent vows, virtuous, pious, observing good conduct)

(adjective)

Nominative, masculine, plural of suvrata

suvrata - of good conduct, virtuous, pious, observing excellent vows

Compound type : bahuvrīhi (su+vrata)

• su – good, well, excellent
  indeclinable
• vrata – vow, sacred practice, conduct, religious observance
  noun (neuter)

Note: Nominative plural masculine.

सत्यवादिनः (satyavādinaḥ) - (people) who speak the truth (truth-speakers, truthful)

(adjective)

Nominative, masculine, plural of satyavādin

satyavādin - speaking the truth, truthful

Agent noun from satya (truth) + √vad (to speak) + suffix in

Compound type : upapada-tatpuruṣa (satya+vādin)

• satya – truth, reality, truthful
  noun/adjective (neuter)
• vādin – speaker, proclaimer, arguing
  adjective/noun (masculine)
  Agent noun
  From √vad (to speak) + suffix in
  Root: vad (class 1)

Note: Nominative plural masculine.

ब्रह्मभूता (brahmabhūtā) - (people) who have become one with Brahman (brahman) (become Brahman, attained to Brahman, identified with Brahman)

(adjective)

Nominative, masculine, plural of brahmabhūta

brahmabhūta - become Brahman, identified with Brahman

Compound type : tatpuruṣa (brahman+bhūta)

• brahman – the Absolute Reality, ultimate truth, sacred utterance, the Veda
  noun (neuter)
• bhūta – become, being, existed, element, creature
  adjective/noun
  Past Passive Participle
  PPP of √bhū (to be, become)
  Root: bhū (class 1)

Note: Nominative plural masculine.

नराः (narāḥ) - people (men, people)

(noun)

Nominative, masculine, plural of nara

nara - man, human being, hero

Note: Nominative plural masculine.

पुण्याः (puṇyāḥ) - virtuous (people) (virtuous, righteous, holy, meritorious)

(adjective)

Nominative, masculine, plural of puṇya

puṇya - virtuous, righteous, good, holy, meritorious

Note: Nominative plural masculine, agreeing with narāḥ.

पुराणाः (purāṇāḥ) - ancient (people) (ancient, old, primeval)

(adjective)

Nominative, masculine, plural of purāṇa

purāṇa - ancient, old, primeval, a class of religious texts

Note: Nominative plural masculine, agreeing with narāḥ.

कुरुनन्दन (kurunandana) - O descendant of Kuru (a vocative address) (O delight of the Kurus, O son of Kuru)

(proper noun)

Vocative, masculine, singular of kurunandana

kurunandana - delight of the Kurus, descendant of Kuru

Compound type : tatpuruṣa (kuru+nandana)

• kuru – Kuru (an ancient king or his dynasty)
  proper noun (masculine)
• nandana – son, delight, gladdening
  noun (masculine)

Note: Vocative singular masculine.