महाभारतः mahābhārataḥ - book-12, chapter-102, verse-4

सर्वशस्त्रेषु कुशलाः सत्त्ववन्तो ह्युशीनराः ।
प्राच्या मातङ्गयुद्धेषु कुशलाः शठयोधिनः ॥४॥

4. sarvaśastreṣu kuśalāḥ sattvavanto hyuśīnarāḥ ,
prācyā mātaṅgayuddheṣu kuśalāḥ śaṭhayodhinaḥ.

4. sarvaśastreṣu kuśalāḥ sattvavantaḥ hi uśīnarāḥ
prācyāḥ mātaṅgayuddheṣu kuśalāḥ śaṭhayodhinaḥ

4. hi uśīnarāḥ sattvavantaḥ sarvaśastreṣu kuśalāḥ
prācyāḥ mātaṅgayuddheṣu kuśalāḥ śaṭhayodhinaḥ

4. Indeed, the Ushinaras are courageous and skilled in all weapons. The Easterners are adept in elephant battles and are cunning warriors.

Words meanings summery:

• सर्वशस्त्रेषु (sarvaśastreṣu) - in all weapons, regarding all weapons

• कुशलाः (kuśalāḥ) - skilled, expert, proficient

• सत्त्ववन्तः (sattvavantaḥ) - couragous, strong, resolute

• हि (hi) - indeed, for, because

• उशीनराः (uśīnarāḥ) - the Ushinaras (a people)

• प्राच्याः (prācyāḥ) - the Easterners, people from the East

• मातङ्गयुद्धेषु (mātaṅgayuddheṣu) - in elephant battles, in warfare with elephants

• कुशलाः (kuśalāḥ) - skilled, expert, proficient

• शठयोधिनः (śaṭhayodhinaḥ) - cunning fighters, deceitful warriors

Words meanings and morphology

सर्वशस्त्रेषु (sarvaśastreṣu) - in all weapons, regarding all weapons

(noun)

Locative, neuter, plural of sarvaśastra

sarvaśastra - all weapons, every kind of weapon

Compound type : karmadhāraya (sarva+śastra)

• sarva – all, every
  pronoun
• śastra – weapon, implement
  noun (neuter)
  Root: śas

कुशलाः (kuśalāḥ) - skilled, expert, proficient

(adjective)

Nominative, masculine, plural of kuśala

kuśala - skilled, expert, clever, auspicious

Note: Refers to Ushinaras and Pracyas.

सत्त्ववन्तः (sattvavantaḥ) - couragous, strong, resolute

(adjective)

Nominative, masculine, plural of sattvavat

sattvavat - couragous, strong-minded, powerful

Possessive adjective (matup) from 'sattva'

Note: Describes the Ushinaras.

हि (hi) - indeed, for, because

(indeclinable)

Emphatic/causal particle

उशीनराः (uśīnarāḥ) - the Ushinaras (a people)

(proper noun)

Nominative, masculine, plural of uśīnara

uśīnara - a member of the Ushinaras tribe, name of a people

प्राच्याः (prācyāḥ) - the Easterners, people from the East

(adjective)

Nominative, masculine, plural of prācya

prācya - eastern, belonging to the East, an Easterner

Derived from 'prāc' (east) with suffix -ya

Note: Functions as a noun here.

मातङ्गयुद्धेषु (mātaṅgayuddheṣu) - in elephant battles, in warfare with elephants

(noun)

Locative, neuter, plural of mātaṅgayuddha

mātaṅgayuddha - elephant battle

Compound type : tatpuruṣa (mātaṅga+yuddha)

• mātaṅga – elephant
  noun (masculine)
• yuddha – battle, fight, war
  noun (neuter)
  Past Passive Participle (used as noun)
  From √yudh
  Root: yudh (class 4)

कुशलाः (kuśalāḥ) - skilled, expert, proficient

(adjective)

Nominative, masculine, plural of kuśala

kuśala - skilled, expert, clever, auspicious

Note: Refers to Ushinaras and Pracyas.

शठयोधिनः (śaṭhayodhinaḥ) - cunning fighters, deceitful warriors

(adjective)

Nominative, masculine, plural of śaṭhayodhin

śaṭhayodhin - cunning warrior, deceitful fighter

Compound type : karmadhāraya (śaṭha+yodhin)

• śaṭha – cunning, deceitful, wicked
  adjective (masculine)
• yodhin – fighter, warrior
  noun (masculine)
  Agent noun from √yudh
  Root: yudh (class 4)

Note: Describes the Easterners.