महाभारतः mahābhārataḥ - book-12, chapter-167, verse-20

मित्रद्रोहो न कर्तव्यः पुरुषेण विशेषतः ।
मित्रध्रुङ्निरयं घोरमनन्तं प्रतिपद्यते ॥२०॥

20. mitradroho na kartavyaḥ puruṣeṇa viśeṣataḥ ,
mitradhruṅnirayaṁ ghoramanantaṁ pratipadyate.

20. mitradrohaḥ na kartavyaḥ puruṣeṇa viśeṣataḥ |
mitradhruk nirayam ghoram anantam pratipadyate

20. puruṣeṇa mitradrohaḥ na viśeṣataḥ kartavyaḥ
mitradhruk ghoram anantam nirayam pratipadyate

20. Betrayal of a friend should never be committed by a person, especially. One who betrays a friend will attain a dreadful, endless hell.

Words meanings summery:

• मित्रद्रोहः (mitradrohaḥ) - betrayal of a friend, harming a friend

• न (na) - not

• कर्तव्यः (kartavyaḥ) - to be done, ought to be done

• पुरुषेण (puruṣeṇa) - by a person, by a man

• विशेषतः (viśeṣataḥ) - especially, particularly

• मित्रध्रुक् (mitradhruk) - one who betrays a friend, a traitor to a friend

• निरयम् (nirayam) - to hell, to the abode of torment

• घोरम् (ghoram) - dreadful, terrible, fearful

• अनन्तम् (anantam) - endless, infinite, eternal

• प्रतिपद्यते (pratipadyate) - attains, reaches, obtains

Words meanings and morphology

मित्रद्रोहः (mitradrohaḥ) - betrayal of a friend, harming a friend

(noun)

Nominative, masculine, singular of mitradroha

mitradroha - betrayal of a friend, treachery against a friend

Compound type : tatpuruṣa (mitra+droha)

• mitra – friend, companion, sun (Vedic)
  noun (masculine/neuter)
• droha – injury, offense, malice, betrayal
  noun (masculine)
  Root: druh (class 4)

न (na) - not

(indeclinable)

कर्तव्यः (kartavyaḥ) - to be done, ought to be done

(adjective)

Nominative, masculine, singular of kartavya

kartavya - to be done, fit to be done, duty, obligation

Gerundive (Passive Future Participle)

Derived from root kṛ with suffix -tavya

Root: kṛ (class 8)

Note: Agrees with mitradrohaḥ.

पुरुषेण (puruṣeṇa) - by a person, by a man

(noun)

Instrumental, masculine, singular of puruṣa

puruṣa - person, man, human being, spirit, the supreme cosmic person (puruṣa)

Root: pṛ

विशेषतः (viśeṣataḥ) - especially, particularly

(indeclinable)

suffix -tas indicating "from/by means of" or "especially"

मित्रध्रुक् (mitradhruk) - one who betrays a friend, a traitor to a friend

(noun)

Nominative, masculine, singular of mitradruh

mitradruh - betraying a friend, traitor to a friend (adjective or noun)

Derived from mitradruh + nom.sg. suffix (k after h due to sandhi)

Compound type : tatpuruṣa (mitra+druh)

• mitra – friend, companion, sun (Vedic)
  noun (masculine/neuter)
• druh – injuring, hurting, betraying (from root druh)
  noun (masculine/feminine)
  Derived from root druh
  Root: druh (class 4)

Note: The final k is a result of sandhi from h before a hard consonant (or at the end of a phrase). The base is mitradruh.

निरयम् (nirayam) - to hell, to the abode of torment

(noun)

Accusative, masculine, singular of niraya

niraya - hell, underworld, region of torment, evil path

Prefix: ni

Root: i (class 2)

घोरम् (ghoram) - dreadful, terrible, fearful

(adjective)

Accusative, neuter, singular of ghora

ghora - dreadful, terrible, fearful, formidable

Root: ghū

Note: Agrees with nirayam.

अनन्तम् (anantam) - endless, infinite, eternal

(adjective)

Accusative, neuter, singular of ananta

ananta - endless, infinite, eternal, limitless (often refers to Viṣṇu or the serpent Śeṣa)

From 'a-' (negation) + 'anta' (end)

Compound type : bahuvrīhi (a+anta)

• a – not, non-
  indeclinable
  Negative prefix
• anta – end, limit, boundary, conclusion
  noun (masculine)
  Root: ant

Note: Agrees with nirayam.

प्रतिपद्यते (pratipadyate) - attains, reaches, obtains

(verb)

3rd person , singular, middle, present (laṭ) of pratipad

From prati (towards) + root pad (to go, fall)

Prefix: prati

Root: pad (class 4)