महाभारतः mahābhārataḥ - book-3, chapter-16, verse-17

प्रकृत्या विषमं दुर्गं प्रकृत्या च सुरक्षितम् ।
प्रकृत्या चायुधोपेतं विशेषेण तदानघ ॥१७॥

17. prakṛtyā viṣamaṁ durgaṁ prakṛtyā ca surakṣitam ,
prakṛtyā cāyudhopetaṁ viśeṣeṇa tadānagha.

17. prakṛtyā viṣamaṃ durgaṃ prakṛtyā ca surakṣitam
prakṛtyā ca āyudhopetaṃ viśeṣeṇa tadā anagha

17. O sinless one (anagha), that fortress (durga) was naturally rugged, and naturally well-protected, and naturally equipped with weapons; it was especially so then.

Words meanings summery:

• प्रकृत्या (prakṛtyā) - naturally, by its very constitution (prakṛti) (by nature, naturally, essentially)

• विषमं (viṣamaṁ) - rugged, difficult (to traverse or attack) (uneven, difficult, rugged, inaccessible)

• दुर्गं (durgaṁ) - fortress, stronghold (fort, stronghold, difficult place, inaccessible place)

• प्रकृत्या (prakṛtyā) - naturally, by its very constitution (prakṛti) (by nature, naturally, essentially)

• च (ca) - and (and, also, moreover)

• सुरक्षितम् (surakṣitam) - well-protected (well-protected, well-guarded, very safe)

• प्रकृत्या (prakṛtyā) - naturally, by its very constitution (prakṛti) (by nature, naturally, essentially)

• च (ca) - and (and, also, moreover)

• आयुधोपेतं (āyudhopetaṁ) - equipped with weapons (equipped with weapons, furnished with arms)

• विशेषेण (viśeṣeṇa) - especially, particularly (especially, particularly, distinctively, pre-eminently)

• तदा (tadā) - then (referring to the time of preparation or general characteristic) (then, at that time)

• अनघ (anagha) - O sinless one (vocative, common address in Mahābhārata) (O sinless one, O faultless one, O innocent one)

Words meanings and morphology

प्रकृत्या (prakṛtyā) - naturally, by its very constitution (prakṛti) (by nature, naturally, essentially)

(noun)

Instrumental, feminine, singular of prakṛti

prakṛti - nature, original form, constitution (prakṛti), fundamental matter, primary cause

From `pra-kṛ` (to make, to do, to create)

Prefix: pra

Root: kṛ (class 8)

विषमं (viṣamaṁ) - rugged, difficult (to traverse or attack) (uneven, difficult, rugged, inaccessible)

(adjective)

Nominative, neuter, singular of viṣama

viṣama - uneven, unequal, difficult, arduous, rough, not level

From `vi-sama` (not even)

दुर्गं (durgaṁ) - fortress, stronghold (fort, stronghold, difficult place, inaccessible place)

(noun)

Nominative, neuter, singular of durga

durga - fort, stronghold, difficult to access place, bad path, distress

From `dur` (difficult) + `ga` (going)

Compound type : bahuvrīhi (dur+ga)

• dur – badly, difficult, hard
  indeclinable
  prefix
• ga – going, moving, a goer
  adjective (masculine)
  Derived from root `gam` (to go)
  Root: gam (class 1)

प्रकृत्या (prakṛtyā) - naturally, by its very constitution (prakṛti) (by nature, naturally, essentially)

(noun)

Instrumental, feminine, singular of prakṛti

prakṛti - nature, original form, constitution (prakṛti), fundamental matter, primary cause

From `pra-kṛ` (to make, to do, to create)

Prefix: pra

Root: kṛ (class 8)

च (ca) - and (and, also, moreover)

(indeclinable)

सुरक्षितम् (surakṣitam) - well-protected (well-protected, well-guarded, very safe)

(adjective)

Nominative, neuter, singular of surakṣita

surakṣita - well-protected, well-guarded, very safe

Past Passive Participle

From `su-rakṣ` (to protect well)

Prefix: su

Root: rakṣ (class 1)

प्रकृत्या (prakṛtyā) - naturally, by its very constitution (prakṛti) (by nature, naturally, essentially)

(noun)

Instrumental, feminine, singular of prakṛti

prakṛti - nature, original form, constitution (prakṛti), fundamental matter, primary cause

From `pra-kṛ` (to make, to do, to create)

Prefix: pra

Root: kṛ (class 8)

च (ca) - and (and, also, moreover)

(indeclinable)

आयुधोपेतं (āyudhopetaṁ) - equipped with weapons (equipped with weapons, furnished with arms)

(adjective)

Nominative, neuter, singular of āyudhopeta

āyudhopeta - furnished with arms, equipped with weapons

Compound: `āyudha` (weapon) + `upeta` (possessed of, furnished with)

Compound type : tatpurusha (āyudha+upeta)

• āyudha – weapon, implement, tool
  noun (neuter)
• upeta – possessed of, furnished with, joined, approached
  adjective (neuter)
  Past Passive Participle
  From `upa-i` (to go near, to obtain)
  Prefix: upa
  Root: i (class 2)

विशेषेण (viśeṣeṇa) - especially, particularly (especially, particularly, distinctively, pre-eminently)

(noun)

Instrumental, masculine, singular of viśeṣa

viśeṣa - distinction, peculiarity, excellence, special quality, difference

From `vi-śiṣ` (to distinguish)

Prefix: vi

Root: śiṣ (class 7)

तदा (tadā) - then (referring to the time of preparation or general characteristic) (then, at that time)

(indeclinable)

Derived from the pronominal stem `tad`

अनघ (anagha) - O sinless one (vocative, common address in Mahābhārata) (O sinless one, O faultless one, O innocent one)

(adjective)

Vocative, masculine, singular of anagha

anagha - sinless, faultless, pure, innocent

`a` (not) + `agha` (sin, fault)

Compound type : nañ-bahuvrīhi (a+agha)

• a – not, non-
  indeclinable
  Negative prefix
• agha – sin, fault, evil, distress
  noun (neuter)