महाभारतः mahābhārataḥ - book-8, chapter-50, verse-21

एवमुक्तोऽब्रवीत्पार्थं केशवो राजसत्तम ।
शक्तोऽस्मि भरतश्रेष्ठ यत्नं कर्तुं यथाबलम् ॥२१॥

21. evamukto'bravītpārthaṁ keśavo rājasattama ,
śakto'smi bharataśreṣṭha yatnaṁ kartuṁ yathābalam.

21. evaṃ uktaḥ abravīt pārthaṃ keśavaḥ rājasattama |
śaktaḥ asmi bharataśreṣṭha yatnaṃ kartuṃ yathābalam

21. rājasattama bharataśreṣṭha evaṃ uktaḥ keśavaḥ
pārthaṃ abravīt asmi śaktaḥ yathābalam yatnaṃ kartuṃ

21. Thus addressed, Keśava (Krishna), O foremost of kings, said to Pārtha (Arjuna): "O best among the Bhāratas, I am able to make an effort to the best of my ability."

Words meanings summery:

• एवं (evaṁ) - thus, in this manner, so

• उक्तः (uktaḥ) - spoken, said, addressed

• अब्रवीत् (abravīt) - said, spoke

• पार्थं (pārthaṁ) - to Pārtha, to Arjuna

• केशवः (keśavaḥ) - Keśava (an epithet of Krishna)

• राजसत्तम (rājasattama) - O best of kings, O foremost among kings

• शक्तः (śaktaḥ) - capable, able, powerful

• अस्मि (asmi) - I am

• भरतश्रेष्ठ (bharataśreṣṭha) - O best among the descendants of Bharata (referring to Arjuna) (O best of Bhāratas)

• यत्नं (yatnaṁ) - effort, exertion, endeavor

• कर्तुं (kartuṁ) - to do, to make, to perform

• यथाबलम् (yathābalam) - according to strength, to the best of one's ability

Words meanings and morphology

एवं (evaṁ) - thus, in this manner, so

(indeclinable)

उक्तः (uktaḥ) - spoken, said, addressed

(adjective)

Nominative, masculine, singular of ukta

ukta - spoken, said, uttered

Past Passive Participle

Derived from root 'vac' (to speak)

Root: vac (class 2)

अब्रवीत् (abravīt) - said, spoke

(verb)

3rd person , singular, active, past imperfect (laṅ) of brū

Root: brū (class 2)

पार्थं (pārthaṁ) - to Pārtha, to Arjuna

(proper noun)

Accusative, masculine, singular of pārtha

pārtha - son of Pṛthā (Kuntī), an epithet of Arjuna

केशवः (keśavaḥ) - Keśava (an epithet of Krishna)

(proper noun)

Nominative, masculine, singular of keśava

keśava - having beautiful hair; slayer of the demon Keśī; an epithet of Krishna/Vishnu

राजसत्तम (rājasattama) - O best of kings, O foremost among kings

(noun)

Vocative, masculine, singular of rājasattama

rājasattama - best of kings

Compound type : tatpuruṣa (rājan+sattama)

• rājan – king, ruler
  noun (masculine)
• sattama – best, most excellent, supreme
  adjective (masculine)
  Superlative degree of 'sat' (good)

शक्तः (śaktaḥ) - capable, able, powerful

(adjective)

Nominative, masculine, singular of śakta

śakta - able, capable, competent, powerful

Past Passive Participle

Derived from root 'śak' (to be able)

Root: śak (class 5)

अस्मि (asmi) - I am

(verb)

1st person , singular, active, present (laṭ) of as

Root: as (class 2)

भरतश्रेष्ठ (bharataśreṣṭha) - O best among the descendants of Bharata (referring to Arjuna) (O best of Bhāratas)

(noun)

Vocative, masculine, singular of bharataśreṣṭha

bharataśreṣṭha - best of the Bhāratas

Compound type : tatpuruṣa (bharata+śreṣṭha)

• bharata – a descendant of Bharata; a name of India
  proper noun (masculine)
• śreṣṭha – best, excellent, superior
  adjective (masculine)

यत्नं (yatnaṁ) - effort, exertion, endeavor

(noun)

Accusative, masculine, singular of yatna

yatna - effort, exertion, endeavor, attempt

कर्तुं (kartuṁ) - to do, to make, to perform

(verbal derivative)

यथाबलम् (yathābalam) - according to strength, to the best of one's ability

(indeclinable)

Compound type : avyayībhāva (yathā+balam)

• yathā – as, according to, just as
  indeclinable
• balam – strength, power, force
  noun (neuter)