महाभारतः mahābhārataḥ - book-3, chapter-239, verse-18

अथ तं निश्चयं तस्य बुद्ध्वा दैतेयदानवाः ।
पातालवासिनो रौद्राः पूर्वं देवैर्विनिर्जिताः ॥१८॥

18. atha taṁ niścayaṁ tasya buddhvā daiteyadānavāḥ ,
pātālavāsino raudrāḥ pūrvaṁ devairvinirjitāḥ.

18. atha tam niścayam tasya buddhvā daiteyadānavāḥ
pātālavāsinaḥ raudrāḥ pūrvam devaiḥ vinirjitāḥ

18. Then, the fierce Daityas and Danavas (demons), dwellers of Patala who had previously been defeated by the gods, having understood his (Duryodhana's) resolve (niscaya),

Words meanings summery:

• अथ (atha) - then (indicating sequence) (then, now, thereupon)

• तम् (tam) - that (specific) (that)

• निश्चयम् (niścayam) - Duryodhana's resolve (niscaya) for ascetic practice (determination, resolve)

• तस्य (tasya) - Duryodhana's (his, of him)

• बुद्ध्वा (buddhvā) - having understood (Duryodhana's resolve) (having known, having understood, having perceived)

• दैतेयदानवाः (daiteyadānavāḥ) - The demonic beings of the Daitya and Danava clans (Daityas and Danavas (clans of demons))

• पातालवासिनः (pātālavāsinaḥ) - The Daityas and Danavas who reside in Patala (dwellers of Patala (the underworld))

• रौद्राः (raudrāḥ) - The fierce (Daityas and Danavas) (fierce, terrible, formidable)

• पूर्वम् (pūrvam) - previously (before this event) (previously, formerly)

• देवैः (devaiḥ) - by the (celestial) gods (by the gods)

• विनिर्जिताः (vinirjitāḥ) - having been decisively defeated (by the gods) (defeated, conquered)

Words meanings and morphology

अथ (atha) - then (indicating sequence) (then, now, thereupon)

(indeclinable)

तम् (tam) - that (specific) (that)

(pronoun)

Accusative, masculine, singular of tad

tad - that, him, it

निश्चयम् (niścayam) - Duryodhana's resolve (niscaya) for ascetic practice (determination, resolve)

(noun)

Accusative, masculine, singular of niścaya

niścaya - determination, resolve, certainty, ascertainment

Prefix: nis

Root: √ci (चि) (class 5)

तस्य (tasya) - Duryodhana's (his, of him)

(pronoun)

Genitive, masculine, singular of tad

tad - that, his, of him

बुद्ध्वा (buddhvā) - having understood (Duryodhana's resolve) (having known, having understood, having perceived)

(indeclinable)

absolutives (gerund)

formed from root √budh + suffix ktvā

Root: √budh (बुध्) (class 1)

दैतेयदानवाः (daiteyadānavāḥ) - The demonic beings of the Daitya and Danava clans (Daityas and Danavas (clans of demons))

(noun)

Nominative, masculine, plural of daiteyadānava

daiteyadānava - Daityas and Danavas (demonic races, often associated with Asuras)

Dvandva compound of Daitya and Danava.

Compound type : dvandva (daiteya+dānava)

• daiteya – descendant of Diti, a Daitya (demon)
  noun (masculine)
  From Diti + ḍhak
• dānava – descendant of Danu, a Danava (demon)
  noun (masculine)
  From Danu + aṇ

Note: Subject of the verb in the next verse.

पातालवासिनः (pātālavāsinaḥ) - The Daityas and Danavas who reside in Patala (dwellers of Patala (the underworld))

(adjective)

Nominative, masculine, plural of pātālavāsin

pātālavāsin - dweller of Patala, inhabitant of the underworld

From pātāla + vāsin (from root √vas to dwell)

Compound type : tatpurusha (pātāla+vāsin)

• pātāla – the lowest of the seven regions below the earth, the underworld
  noun (neuter)
• vāsin – dweller, inhabitant, residing
  adjective (masculine)
  agent noun/adjective
  From root √vas (to dwell) + ṇini suffix
  Root: √vas (वस्) (class 1)

रौद्राः (raudrāḥ) - The fierce (Daityas and Danavas) (fierce, terrible, formidable)

(adjective)

Nominative, masculine, plural of raudra

raudra - fierce, terrible, formidable, awful, relating to Rudra

पूर्वम् (pūrvam) - previously (before this event) (previously, formerly)

(indeclinable)

Accusative neuter singular used adverbially.

Note: Adverbial use of neuter accusative singular.

देवैः (devaiḥ) - by the (celestial) gods (by the gods)

(noun)

Instrumental, masculine, plural of deva

deva - god, deity, celestial being

Root: √div (दिव्) (class 4)

Note: Agent in a passive construction.

विनिर्जिताः (vinirjitāḥ) - having been decisively defeated (by the gods) (defeated, conquered)

(adjective)

Nominative, masculine, plural of vinirjita

vinirjita - vanquished, conquered, defeated, overcome

Past Passive Participle

Formed with prefixes vi + nir + root √ji + suffix kta

Prefixes: vi+nis

Root: √ji (जि) (class 1)