योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-89, verse-43

श्रृणु युक्त्या कया योगी तनुच्छेदादिविभ्रमैः ।
नाक्रम्यते महाबाहो बहुवर्षशतैरपि ॥ ४३ ॥

śrṛṇu yuktyā kayā yogī tanucchedādivibhramaiḥ ,
nākramyate mahābāho bahuvarṣaśatairapi 43

43. śṛṇu yuktyā kayā yogī tanucchedādivibhramaiḥ
na ākramyate mahābāho bahuvarṣaśataiḥ api

43. mahābāho śṛṇu kayā yuktyā yogī tanucchedādivibhramaiḥ
bahuvarṣaśataiḥ api na ākramyate

43. Listen, O mighty-armed one, to the reasoning by which a yogi (yoga practitioner) is not affected by the illusions of bodily harm and the like, even over many hundreds of years.

Words meanings summery:

• शृणु (śṛṇu) - listen, hear

• युक्त्या (yuktyā) - by means of reason, by what logic, by a device or method

• कया (kayā) - by which (feminine)

• योगी (yogī) - a yogi, one who practices yoga

• तनुच्छेदादिविभ्रमैः (tanucchedādivibhramaiḥ) - by illusions like the cutting of the body and so on

• न (na) - not, no

• आक्रम्यते (ākramyate) - is assailed, is overcome, is affected

• महाबाहो (mahābāho) - an epithet, addressing the recipient of the teaching (presumably Rāma) (O mighty-armed one)

• बहुवर्षशतैः (bahuvarṣaśataiḥ) - by hundreds of many years

• अपि (api) - even, also, too

Words meanings and morphology

शृणु (śṛṇu) - listen, hear

(verb)

2nd person , singular, active, imperative (loṭ) of śru

Root: śru (class 5)

युक्त्या (yuktyā) - by means of reason, by what logic, by a device or method

(noun)

Instrumental, feminine, singular of yukti

yukti - reason, logic, argument, method, contrivance

Derived from root 'yuj' (to join, connect).

Root: yuj (class 7)

कया (kayā) - by which (feminine)

(pronoun)

Instrumental, feminine, singular of kim

kim - who, what, which

योगी (yogī) - a yogi, one who practices yoga

(noun)

Nominative, masculine, singular of yogin

yogin - a yogi, one who practices yoga (yoga), an ascetic, a meditator

Derived from 'yoga' with suffix '-in'.

तनुच्छेदादिविभ्रमैः (tanucchedādivibhramaiḥ) - by illusions like the cutting of the body and so on

(noun)

Instrumental, masculine, plural of tanucchedādivibhrama

tanucchedādivibhrama - illusions like the cutting of the body and so on

A complex Tatpuruṣa compound: 'tanuccheda' (body-cutting) + 'ādi' (etc.) + 'vibhrama' (illusion).

Compound type : tatpuruṣa (tanu+cheda+ādi+vibhrama)

• tanu – body, limb, form
  noun (feminine)
• cheda – cutting, severing, destruction, division
  noun (masculine)
  Derived from root 'chid' (to cut, sever).
  Root: chid (class 7)
• ādi – beginning; and so on, etc.
  indeclinable (masculine)
• vibhrama – illusion, error, confusion, delusion
  noun (masculine)
  Derived from root 'bhram' (to wander, be confused) with prefix 'vi-'.
  Prefix: vi
  Root: bhram (class 1)

न (na) - not, no

(indeclinable)

आक्रम्यते (ākramyate) - is assailed, is overcome, is affected

(verb)

3rd person , singular, passive, present (laṭ) of ākram

Prefix: ā

Root: kram (class 1)

महाबाहो (mahābāho) - an epithet, addressing the recipient of the teaching (presumably Rāma) (O mighty-armed one)

(adjective)

Vocative, masculine, singular of mahābāhu

mahābāhu - mighty-armed, one with great arms

A Bahuvrīhi compound, meaning 'he whose arms are great'.

Compound type : bahuvrīhi (mahā+bāhu)

• mahā – great, large, mighty
  adjective
  Stem form of 'mahat'.
• bāhu – arm
  noun (masculine)

बहुवर्षशतैः (bahuvarṣaśataiḥ) - by hundreds of many years

(noun)

Instrumental, neuter, plural of bahuvarṣaśata

bahuvarṣaśata - hundreds of many years

A Tatpuruṣa compound of 'bahuvarṣa' (many years) and 'śata' (hundred).

Compound type : tatpuruṣa (bahu+varṣa+śata)

• bahu – many, much
  adjective
• varṣa – year, rain
  noun (neuter)
• śata – hundred
  noun (neuter)

अपि (api) - even, also, too

(indeclinable)