योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-170, verse-31

वस्तुशून्येषु वादेषु मूकः शैलमयो यथा ।
निष्प्रयोजनशब्देषु परं बाधिर्यमागतः ॥ ३१ ॥

vastuśūnyeṣu vādeṣu mūkaḥ śailamayo yathā ,
niṣprayojanaśabdeṣu paraṃ bādhiryamāgataḥ 31

31. vastuśūnyeṣu vādeṣu mūkaḥ śailamayaḥ yathā
niṣprayojanaśabdeṣu param bādhiryam āgataḥ

31. vastuśūnyeṣu vādeṣu yathā śailamayaḥ mūkaḥ
[saḥ] niṣprayojanaśabdeṣu param bādhiryam āgataḥ

31. In arguments devoid of substance, he is as silent as a stone image. Regarding useless words, he has attained supreme deafness.

Words meanings summery:

• वस्तुशून्येषु (vastuśūnyeṣu) - in arguments devoid of substance (in those devoid of substance, in those empty of reality)

• वादेषु (vādeṣu) - in arguments (in arguments, in discourses, in doctrines)

• मूकः (mūkaḥ) - silent (mute, silent, dumb)

• शैलमयः (śailamayaḥ) - as a stone image (made of rock, stone-like)

• यथा (yathā) - just as (just as, like, in the manner that)

• निष्प्रयोजनशब्देषु (niṣprayojanaśabdeṣu) - in useless words (in words without purpose, in useless sounds)

• परम् (param) - supreme (supreme, highest, ultimate; completely, exceedingly)

• बाधिर्यम् (bādhiryam) - deafness

• आगतः (āgataḥ) - attained, reached (come, arrived, obtained, reached)

Words meanings and morphology

वस्तुशून्येषु (vastuśūnyeṣu) - in arguments devoid of substance (in those devoid of substance, in those empty of reality)

(adjective)

Locative, masculine, plural of vastuśūnya

vastuśūnya - devoid of substance/reality, empty of things

Compound (vastunā śūnyaḥ)

Compound type : 3rd Tatpuruṣa (vastu+śūnya)

• vastu – substance, reality, thing, object
  noun (neuter)
  Root: vas
• śūnya – empty, void, devoid of
  adjective
  Derived from root śū (to swell) + nya
  Root: śū

Note: Agrees with 'vādeṣu'

वादेषु (vādeṣu) - in arguments (in arguments, in discourses, in doctrines)

(noun)

Locative, masculine, plural of vāda

vāda - speech, discourse, argument, doctrine

Derived from root vad (to speak)

Root: vad (class 1)

मूकः (mūkaḥ) - silent (mute, silent, dumb)

(adjective)

Nominative, masculine, singular of mūka

mūka - mute, dumb, silent

शैलमयः (śailamayaḥ) - as a stone image (made of rock, stone-like)

(adjective)

Nominative, masculine, singular of śailamaya

śailamaya - made of rock/stone, rocky

Formed with suffix -maya (made of)

यथा (yathā) - just as (just as, like, in the manner that)

(indeclinable)

निष्प्रयोजनशब्देषु (niṣprayojanaśabdeṣu) - in useless words (in words without purpose, in useless sounds)

(noun)

Locative, masculine, plural of niṣprayojanaśabda

niṣprayojanaśabda - words without purpose/meaning, useless sounds

Tatpuruṣa compound

Compound type : Karmadhāraya or 6th Tatpuruṣa (niṣprayojana+śabda)

• niṣprayojana – useless, purposeless, without object
  adjective
  Compound (nis + prayojana)
  Prefix: nis
• śabda – sound, word, voice
  noun (masculine)
  Root: śabd

परम् (param) - supreme (supreme, highest, ultimate; completely, exceedingly)

(adjective)

Accusative, neuter, singular of para

para - supreme, highest, ultimate, other

Note: Adjective modifying 'bādhiryam'

बाधिर्यम् (bādhiryam) - deafness

(noun)

Accusative, neuter, singular of bādhirya

bādhirya - deafness

Derived from badhira (deaf) + suffix -ya

Note: Object of 'āgataḥ'

आगतः (āgataḥ) - attained, reached (come, arrived, obtained, reached)

(adjective)

Nominative, masculine, singular of āgata

āgata - come, arrived, obtained, reached

Past Passive Participle

Derived from root gam (to go) with prefix ā

Prefix: ā

Root: gam (class 1)

Note: Used as a predicate adjective, implying 'he has become'