महाभारतः mahābhārataḥ - book-5, chapter-128, verse-20

इमं पुरुषशार्दूलमप्रधृष्यं दुरासदम् ।
आसाद्य न भविष्यन्ति पतंगा इव पावकम् ॥२०॥

20. imaṁ puruṣaśārdūlamapradhṛṣyaṁ durāsadam ,
āsādya na bhaviṣyanti pataṁgā iva pāvakam.

20. imam puruṣaśārdūlam apradhṛṣyam durāsadam
āsādya na bhaviṣyanti pataṅgāḥ iva pāvakam

20. imam apradhṛṣyam durāsadam puruṣaśārdūlam āsādya,
pataṅgāḥ iva pāvakam na bhaviṣyanti

20. Having approached this unconquerable (apradhṛṣyam), unassailable (durāsadam) tiger among men, they will not survive, just like moths perish by fire (pāvakam).

Words meanings summery:

• इमम् (imam) - this (one)

• पुरुषशार्दूलम् (puruṣaśārdūlam) - the tiger among men (referring to Krishna) (tiger among men, best of men)

• अप्रधृष्यम् (apradhṛṣyam) - unconquerable, invincible, unassailable

• दुरासदम् (durāsadam) - difficult to approach, unassailable

• आसाद्य (āsādya) - having approached, having reached, having obtained

• न (na) - not

• भविष्यन्ति (bhaviṣyanti) - they will not survive/endure (they will be, they will become)

• पतङ्गाः (pataṅgāḥ) - moths, insects

• इव (iva) - like, as

• पावकम् (pāvakam) - fire

Words meanings and morphology

इमम् (imam) - this (one)

(pronoun)

Accusative, masculine, singular of idam

idam - this, this one

पुरुषशार्दूलम् (puruṣaśārdūlam) - the tiger among men (referring to Krishna) (tiger among men, best of men)

(noun)

Accusative, masculine, singular of puruṣaśārdūla

puruṣaśārdūla - tiger among men, best of men

Compound type : tatpuruṣa (puruṣa+śārdūla)

• puruṣa – man, person
  noun (masculine)
• śārdūla – tiger
  noun (masculine)

अप्रधृष्यम् (apradhṛṣyam) - unconquerable, invincible, unassailable

(adjective)

Accusative, masculine, singular of apradhṛṣya

apradhṛṣya - unconquerable, invincible, not to be attacked

gerundive

Negated gerundive of root dhṛṣ with prefix pra

Compound type : nañ-tatpuruṣa (a+pradhṛṣya)

• a – not, non-
  indeclinable
• pradhṛṣya – to be dared, to be assailed
  adjective (masculine)
  gerundive
  gerundive of root dhṛṣ with prefix pra
  Prefix: pra
  Root: dhṛṣ (class 5)

दुरासदम् (durāsadam) - difficult to approach, unassailable

(adjective)

Accusative, masculine, singular of durāsada

durāsada - difficult to approach, inaccessible, unassailable

gerundive

gerundive from root sad with prefix ā, and negative prefix dus (difficult)

Compound type : prādi-tatpuruṣa (dus+āsada)

• dus – difficult, bad, hard
  indeclinable
• āsada – approaching, reaching
  noun (masculine)
  from root sad with prefix ā
  Prefix: ā
  Root: sad (class 1)

आसाद्य (āsādya) - having approached, having reached, having obtained

(indeclinable)

absolutive

gerund of root sad with prefix ā

Prefix: ā

Root: sad (class 1)

न (na) - not

(indeclinable)

भविष्यन्ति (bhaviṣyanti) - they will not survive/endure (they will be, they will become)

(verb)

3rd person , plural, active, future (lṛṭ) of bhū

Root: bhū (class 1)

पतङ्गाः (pataṅgāḥ) - moths, insects

(noun)

Nominative, masculine, plural of pataṅga

pataṅga - moth, grasshopper, insect, bird

इव (iva) - like, as

(indeclinable)

पावकम् (pāvakam) - fire

(noun)

Accusative, masculine, singular of pāvaka

pāvaka - fire, pure, purifying

Root: pū (class 1)