महाभारतः mahābhārataḥ - book-10, chapter-7, verse-5

मनसाप्यसुचिन्त्येन दुष्करेणाल्पचेतसा ।
सोऽहमात्मोपहारेण यक्ष्ये त्रिपुरघातिनम् ॥५॥

5. manasāpyasucintyena duṣkareṇālpacetasā ,
so'hamātmopahāreṇa yakṣye tripuraghātinam.

5. manasā api asucintyena duṣkareṇa alpacetasā
saḥ aham ātmopahāreṇa yakṣye tripuraghātinam

5. saḥ aham alpacetasā api manasā asucintyena
duṣkareṇa ātmopahāreṇa tripuraghātinam yakṣye

5. Even by my mind (manasā), with an inconceivable and arduous act—for I am of little intellect—I will worship the destroyer of Tripura (Tripuraghātin) through the offering of my very self (ātman).

Words meanings summery:

• मनसा (manasā) - by the mind

• अपि (api) - even, also, too

• असुचिन्त्येन (asucintyena) - by the inconceivable, by that which cannot be thought

• दुष्करेण (duṣkareṇa) - by the difficult, by the arduous

• अल्पचेतसा (alpacetasā) - by the one with little intellect

• सः (saḥ) - he, that

• अहम् (aham) - I

• आत्मोपहारेण (ātmopahāreṇa) - by the offering of myself, by self-sacrifice

• यक्ष्ये (yakṣye) - I shall worship, I shall sacrifice

• त्रिपुरघातिनम् (tripuraghātinam) - the destroyer of Tripura

Words meanings and morphology

मनसा (manasā) - by the mind

(noun)

Instrumental, neuter, singular of manas

manas - mind, intellect, heart

अपि (api) - even, also, too

(indeclinable)

असुचिन्त्येन (asucintyena) - by the inconceivable, by that which cannot be thought

(adjective)

Instrumental, masculine, singular of asucintya

asucintya - inconceivable, unthinkable, that which cannot be easily thought of

Gerundive

Formed with prefix 'a-' (negation) + 'su-' (well/easily) + root 'cint' (to think) + suffix '-ya' (potential passive participle/gerundive). The 'su' is negated. So 'not easily thought'.

Prefixes: a+su

Root: cint (class 10)

दुष्करेण (duṣkareṇa) - by the difficult, by the arduous

(adjective)

Instrumental, masculine, singular of duṣkara

duṣkara - difficult, arduous, hard to do

Compound type : pradi (dur+kara)

• dur – bad, difficult, hard
  indeclinable
• kara – doing, making, causing
  adjective
  Root: kṛ (class 8)

अल्पचेतसा (alpacetasā) - by the one with little intellect

(noun)

Instrumental, masculine, singular of alpacetas

alpacetas - having little intellect or mind, dull-witted

Compound type : bahuvrīhi (alpa+cetas)

• alpa – little, small, few
  adjective
• cetas – mind, intellect, consciousness
  noun (neuter)

सः (saḥ) - he, that

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

अहम् (aham) - I

(pronoun)

Nominative, singular of asmad

asmad - I, we (first person pronoun)

आत्मोपहारेण (ātmopahāreṇa) - by the offering of myself, by self-sacrifice

(noun)

Instrumental, masculine, singular of ātmopahāra

ātmopahāra - self-offering, sacrifice of oneself

Compound type : tatpuruṣa (ātman+upahāra)

• ātman – self, soul, spirit, ultimate reality
  noun (masculine)
• upahāra – offering, present, tribute
  noun (masculine)
  Prefix: upa
  Root: hṛ (class 1)

यक्ष्ये (yakṣye) - I shall worship, I shall sacrifice

(verb)

1st person , singular, middle, future (lṛṭ) of yaj

Root: yaj (class 1)

त्रिपुरघातिनम् (tripuraghātinam) - the destroyer of Tripura

(noun)

Accusative, masculine, singular of tripuraghātin

tripuraghātin - slayer of the three cities (Tripura), an epithet of Shiva

Compound type : tatpuruṣa (tripura+ghātin)

• tripura – the three cities (mythical cities destroyed by Shiva)
  noun (neuter)
• ghātin – slayer, killer, destroyer
  adjective
  Root: han (class 2)