योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-49, verse-38

ज्ञानस्यापरिपूर्णत्वान्न शक्रोषि मनोभ्रमम् ।
विनिवारयितुं मेघमसम्यग्यत्नवानिव ॥ ३८ ॥

jñānasyāparipūrṇatvānna śakroṣi manobhramam ,
vinivārayituṃ meghamasamyagyatnavāniva 38

38. jñānasya aparipūrṇatvāt na śakroṣi manobhramam
vinivārayitum megham asamyak yatnavān iva

38. jñānasya aparipūrṇatvāt na manobhramam
vinivārayitum śakroṣi asamyak yatnavān megham iva

38. Due to the incompleteness of your knowledge, you are unable to prevent mental delusion, just like someone with insufficient effort trying to ward off a cloud.

Words meanings summery:

• ज्ञानस्य (jñānasya) - of knowledge, of spiritual knowledge

• अपरिपूर्णत्वात् (aparipūrṇatvāt) - due to incompleteness, from not being full

• न (na) - not, no

• शक्रोषि (śakroṣi) - you are able, you can

• मनोभ्रमम् (manobhramam) - mental delusion, delusion of the mind

• विनिवारयितुम् (vinivārayitum) - to prevent, to ward off, to keep away

• मेघम् (megham) - cloud

• असम्यक् (asamyak) - improperly, wrongly, insufficiently

• यत्नवान् (yatnavān) - possessing effort, diligent, making effort

• इव (iva) - like, as, just as

Words meanings and morphology

ज्ञानस्य (jñānasya) - of knowledge, of spiritual knowledge

(noun)

Genitive, neuter, singular of jñāna

jñāna - knowledge, spiritual knowledge, wisdom

Root: jñā (class 9)

अपरिपूर्णत्वात् (aparipūrṇatvāt) - due to incompleteness, from not being full

(noun)

Ablative, neuter, singular of aparipūrṇatva

aparipūrṇatva - incompleteness, imperfection

Compound type : tatpuruṣa (a+paripūrṇatva)

• a – not, non-, un- (negative prefix)
  indeclinable
• paripūrṇatva – completeness, fullness, perfection
  noun (neuter)
  Derived from 'paripūrṇa' with suffix '-tva'.
• pari – around, completely, fully (prefix)
  indeclinable
• pūrṇa – full, complete, filled
  adjective
  Past Passive Participle
  Derived from root 'pṛ' (to fill).
  Root: pṛ (class 9)
• tva – suffix for abstract nouns, -ness, -hood
  indeclinable

न (na) - not, no

(indeclinable)

शक्रोषि (śakroṣi) - you are able, you can

(verb)

2nd person , singular, active, present (laṭ) of śak

Root: śak (class 5)

मनोभ्रमम् (manobhramam) - mental delusion, delusion of the mind

(noun)

Accusative, masculine, singular of manobhrama

manobhrama - mental delusion, illusion of the mind

Compound type : tatpuruṣa (manas+bhrama)

• manas – mind, intellect, consciousness
  noun (neuter)
  Root: man (class 4)
• bhrama – wandering, error, delusion, confusion
  noun (masculine)
  Root: bhram (class 1)

विनिवारयितुम् (vinivārayitum) - to prevent, to ward off, to keep away

(indeclinable)

Infinitive (causative)

Causative infinitive of root 'vṛ' (to choose, to cover) with prefixes 'vi' and 'ni'.

Prefixes: vi+ni

Root: vṛ (class 5)

मेघम् (megham) - cloud

(noun)

Accusative, masculine, singular of megha

megha - cloud

Root: mih (class 1)

असम्यक् (asamyak) - improperly, wrongly, insufficiently

(adjective)

of asamyac

asamyac - improper, incorrect, insufficient

Compound type : prādi-samāsa (a+samyac)

• a – not, non-, un- (negative prefix)
  indeclinable
• samyac – proper, correct, complete
  adjective (masculine)
  Prefix: sam
  Root: añc (class 1)

Note: Used adverbially here.

यत्नवान् (yatnavān) - possessing effort, diligent, making effort

(adjective)

Nominative, masculine, singular of yatnavat

yatnavat - one who makes effort, diligent

Possessive suffix '-vat' added to 'yatna'.

इव (iva) - like, as, just as

(indeclinable)