महाभारतः mahābhārataḥ - book-3, chapter-44, verse-4

नातप्ततपसा शक्यो द्रष्टुं नानाहिताग्निना ।
स लोकः पुण्यकर्तॄणां नापि युद्धपराङ्मुखैः ॥४॥

4. nātaptatapasā śakyo draṣṭuṁ nānāhitāgninā ,
sa lokaḥ puṇyakartṝṇāṁ nāpi yuddhaparāṅmukhaiḥ.

4. na ataptatapasā śakyaḥ draṣṭum na anāhitāgninā
sa lokaḥ puṇyakartṝṇām na api yuddhaparaṅmukhaiḥ

4. That realm, which belongs to those who perform meritorious deeds, cannot be seen by one who has not practiced severe austerities (tapas), nor by one who has not maintained the sacred fires, nor even by those who turn their back on battle.

Words meanings summery:

• न (na) - not, no

• अतप्ततपसा (ataptatapasā) - by one who has not performed severe austerities (tapas) (by one who has not performed austerities)

• शक्यः (śakyaḥ) - possible to be seen (possible, able (to be done))

• द्रष्टुम् (draṣṭum) - to see, to be seen

• न (na) - not, no

• अनाहिताग्निना (anāhitāgninā) - by one who has not maintained the sacred fires

• स (sa) - that, he

• लोकः (lokaḥ) - world, realm, region

• पुण्यकर्तॄणाम् (puṇyakartṝṇām) - of those who perform meritorious deeds

• न (na) - not, nor

• अपि (api) - even, also

• युद्धपरङ्मुखैः (yuddhaparaṅmukhaiḥ) - by those averse to battle, by those turning their back on battle

Words meanings and morphology

न (na) - not, no

(indeclinable)

अतप्ततपसा (ataptatapasā) - by one who has not performed severe austerities (tapas) (by one who has not performed austerities)

(adjective)

Instrumental, masculine, singular of ataptatapas

ataptatapas - one who has not performed austerities

Compound type : bahuvrihi (a+tapta+tapas)

• a – not, un-
  indeclinable
• tapta – heated, performed (as in tapas)
  participle (masculine)
  Past Passive Participle
  From √tap (to heat, practice austerities)
  Root: tap (class 1)
• tapas – austerity, penance
  noun (neuter)

शक्यः (śakyaḥ) - possible to be seen (possible, able (to be done))

(participle)

Nominative, masculine, singular of śakya

śakya - possible, capable

Gerundive

From √śak (to be able)

Root: śak (class 5)

द्रष्टुम् (draṣṭum) - to see, to be seen

(indeclinable)

infinitive

From √dṛś (to see)

Root: dṛś (class 1)

न (na) - not, no

(indeclinable)

अनाहिताग्निना (anāhitāgninā) - by one who has not maintained the sacred fires

(adjective)

Instrumental, masculine, singular of anāhitāgni

anāhitāgni - one who has not maintained the sacred fires

Compound type : bahuvrihi (an+āhita+agni)

• an – not, un-
  indeclinable
• āhita – placed, established (especially a sacred fire)
  participle (masculine)
  Past Passive Participle
  From ā-√dhā (to place, establish)
  Prefix: ā
  Root: dhā (class 3)
• agni – fire, sacred fire
  noun (masculine)

स (sa) - that, he

(pronoun)

Nominative, masculine, singular of tad

tad - that

लोकः (lokaḥ) - world, realm, region

(noun)

Nominative, masculine, singular of loka

loka - world, realm, region

पुण्यकर्तॄणाम् (puṇyakartṝṇām) - of those who perform meritorious deeds

(noun)

Genitive, masculine, plural of puṇyakartṛ

puṇyakartṛ - performer of meritorious deeds

Compound type : tatpurusha (puṇya+kartṛ)

• puṇya – merit, virtuous deed
  noun (neuter)
• kartṛ – doer, performer
  noun (masculine)
  Agent noun from √kṛ (to do)
  Root: kṛ (class 8)

न (na) - not, nor

(indeclinable)

अपि (api) - even, also

(indeclinable)

युद्धपरङ्मुखैः (yuddhaparaṅmukhaiḥ) - by those averse to battle, by those turning their back on battle

(adjective)

Instrumental, masculine, plural of yuddhaparaṅmukha

yuddhaparaṅmukha - turning one's back on battle, averse to battle

Compound type : tatpurusha (yuddha+parāṅmukha)

• yuddha – battle, fight
  noun (neuter)
• parāṅmukha – turned away, averted, averse
  adjective (masculine)
  Prefix: parā