महाभारतः mahābhārataḥ - book-8, chapter-57, verse-31

वैदेहाम्बष्ठकाम्बोजास्तथा नग्नजितस्त्वया ।
गान्धाराश्च यया धृत्या जिताः संख्ये सुदुर्जयाः ॥३१॥

31. vaidehāmbaṣṭhakāmbojāstathā nagnajitastvayā ,
gāndhārāśca yayā dhṛtyā jitāḥ saṁkhye sudurjayāḥ.

31. vaidehāmbhaṣṭhakāmbhojāḥ tathā nagnajitāḥ tvayā
gāndhārāḥ ca yayā dhṛtyā jitāḥ saṃkhye sudurjayāḥ

31. tvayā yayā dhṛtyā saṃkhye sudurjayāḥ
vaidehāmbhaṣṭhakāmbhojāḥ tathā nagnajitāḥ ca gāndhārāḥ jitāḥ

31. The Vaidehas, Ambaṣṭhas, Kāmbojas, Nagnajitas, and Gandharas—who were extremely difficult to conquer in battle—were all defeated by you with that very same resolve (dhṛti).

Words meanings summery:

• वैदेहाम्भष्ठकाम्भोजाः (vaidehāmbhaṣṭhakāmbhojāḥ) - the Vaidehas, Ambaṣṭhas, and Kāmbojas

• तथा (tathā) - and, thus, in that manner

• नग्नजिताः (nagnajitāḥ) - the Nagnajitas (name of an ancient people/tribe)

• त्वया (tvayā) - by you

• गान्धाराः (gāndhārāḥ) - the Gandharas (name of an ancient people/tribe)

• च (ca) - and, also

• यया (yayā) - by which (feminine)

• धृत्या (dhṛtyā) - by resolve, by firmness, by steadfastness

• जिताः (jitāḥ) - conquered, defeated

• संख्ये (saṁkhye) - in battle (in battle, in enumeration, in calculation)

• सुदुर्जयाः (sudurjayāḥ) - very difficult to conquer, invincible

Words meanings and morphology

वैदेहाम्भष्ठकाम्भोजाः (vaidehāmbhaṣṭhakāmbhojāḥ) - the Vaidehas, Ambaṣṭhas, and Kāmbojas

(proper noun)

Nominative, masculine, plural of vaidehāmbhaṣṭhakāmbhoja

vaidehāmbhaṣṭhakāmbhoja - the Vaidehas, Ambaṣṭhas, and Kāmbojas (names of ancient peoples/tribes)

Compound type : dvandva (vaideha+ambaṣṭha+kāmboja)

• vaideha – a person from Videha; a specific caste
  proper noun (masculine)
• ambaṣṭha – a specific caste; name of a people
  proper noun (masculine)
• kāmboja – a person from Kamboja; name of a people
  proper noun (masculine)

तथा (tathā) - and, thus, in that manner

(indeclinable)

नग्नजिताः (nagnajitāḥ) - the Nagnajitas (name of an ancient people/tribe)

(proper noun)

Nominative, masculine, plural of nagnajit

nagnajit - name of a king; name of a people

त्वया (tvayā) - by you

(pronoun)

Instrumental, singular of yuṣmad

yuṣmad - you

गान्धाराः (gāndhārāḥ) - the Gandharas (name of an ancient people/tribe)

(proper noun)

Nominative, masculine, plural of gāndhāra

gāndhāra - a native of Gandhara; name of a people; name of a musical note

च (ca) - and, also

(indeclinable)

यया (yayā) - by which (feminine)

(pronoun)

Instrumental, feminine, singular of yad

yad - which, what

धृत्या (dhṛtyā) - by resolve, by firmness, by steadfastness

(noun)

Instrumental, feminine, singular of dhṛti

dhṛti - resolve, firmness, steadfastness, courage

जिताः (jitāḥ) - conquered, defeated

(adjective)

Nominative, masculine, plural of jita

jita - conquered, victorious, subdued

Past Passive Participle

Derived from the root √ji (to conquer, win) with the -ta suffix.

Root: √ji (class 1)

संख्ये (saṁkhye) - in battle (in battle, in enumeration, in calculation)

(noun)

Locative, neuter, singular of saṃkhya

saṁkhya - battle, war, enumeration, calculation

सुदुर्जयाः (sudurjayāḥ) - very difficult to conquer, invincible

(adjective)

Nominative, masculine, plural of sudurjaya

sudurjaya - very difficult to conquer, invincible

Compound type : praadi-tatpurusha (su+durjaya)

• su – good, well, very, excellent
  indeclinable
• durjaya – difficult to conquer, invincible
  adjective (masculine)
  Gerundive/Future Passive Participle
  Formed with 'dur' (difficult) and 'jaya' (conquest/to be conquered), or directly from dur-√ji-ya.
  Prefix: dur
  Root: √ji (class 1)