योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-51, verse-40

नीरसः शान्तमननो निर्वाणाहंकृतिः कृती ।
वीतरागो निरायासः शान्तस्तिष्ठति बुद्धधीः ॥ ४० ॥

nīrasaḥ śāntamanano nirvāṇāhaṃkṛtiḥ kṛtī ,
vītarāgo nirāyāsaḥ śāntastiṣṭhati buddhadhīḥ 40

40. nīrasaḥ śānta-mananaḥ nirvāṇa-ahaṃkṛtiḥ kṛtī
vīta-rāgaḥ nirāyāsaḥ śāntaḥ tiṣṭhati buddha-dhīḥ

40. kṛtī nīrasaḥ śānta-mananaḥ nirvāṇa-ahaṃkṛtiḥ vīta-rāgaḥ nirāyāsaḥ śāntaḥ buddha-dhīḥ tiṣṭhati.

40. The accomplished one, free from desire, with a tranquil mind, whose ego (ahaṃkāra) is extinguished into liberation (nirvāṇa), free from passion, effortless, and peaceful, such a one with an awakened intellect abides.

Words meanings summery:

• नीरसः (nīrasaḥ) - without taste/essence, devoid of desire/interest, dispassionate

• शान्त-मननः (śānta-mananaḥ) - one whose thought/meditation is calmed/quieted

• निर्वाण-अहंकृतिः (nirvāṇa-ahaṁkṛtiḥ) - one whose ego (ahaṃkāra) is extinguished into liberation (nirvāṇa), whose ego is liberated

• कृती (kṛtī) - accomplished, successful, clever, skillful, fulfilled

• वीत-रागः (vīta-rāgaḥ) - free from passion/attachment, dispassionate

• निरायासः (nirāyāsaḥ) - without effort, effortless, free from trouble

• शान्तः (śāntaḥ) - peaceful, calm, tranquil, quieted

• तिष्ठति (tiṣṭhati) - stands, remains, abides, exists

• बुद्ध-धीः (buddha-dhīḥ) - one with awakened intellect/mind

Words meanings and morphology

नीरसः (nīrasaḥ) - without taste/essence, devoid of desire/interest, dispassionate

(adjective)

Nominative, masculine, singular of nīrasa

nīrasa - without juice, tasteless, devoid of passion/interest

Compound type : nañ-bahuvrīhi (ni+rasa)

• ni – without, devoid of
  indeclinable
• rasa – taste, essence, interest, desire
  noun (masculine)

शान्त-मननः (śānta-mananaḥ) - one whose thought/meditation is calmed/quieted

(adjective)

Nominative, masculine, singular of śānta-manana

śānta-manana - one whose thinking is calmed, with a tranquil mind

Compound type : bahuvrīhi (śānta+manana)

• śānta – calmed, tranquil, peaceful
  adjective (masculine)
  Past Passive Participle
  From root śam
  Root: śam (class 4)
• manana – thinking, meditating, reflection, mind
  noun (neuter)
  Root: man (class 4)

निर्वाण-अहंकृतिः (nirvāṇa-ahaṁkṛtiḥ) - one whose ego (ahaṃkāra) is extinguished into liberation (nirvāṇa), whose ego is liberated

(adjective)

Nominative, masculine, singular of nirvāṇa-ahaṃkṛti

nirvāṇa-ahaṁkṛti - one whose ego (ahaṃkāra) is extinguished into liberation (nirvāṇa)

Compound type : bahuvrīhi (nirvāṇa+ahaṃkṛti)

• nirvāṇa – extinction, cessation, liberation (nirvāṇa)
  noun (neuter)
  Prefix: nir
  Root: vā (class 2)
• ahaṃkṛti – ego, egoism (ahaṃkāra)
  noun (feminine)
  Prefix: aham
  Root: kṛ (class 8)

कृती (kṛtī) - accomplished, successful, clever, skillful, fulfilled

(adjective)

Nominative, masculine, singular of kṛtin

kṛtin - accomplished, skillful, happy, successful

वीत-रागः (vīta-rāgaḥ) - free from passion/attachment, dispassionate

(adjective)

Nominative, masculine, singular of vīta-rāga

vīta-rāga - free from passion, dispassionate

Compound type : bahuvrīhi (vīta+rāga)

• vīta – gone, departed, ceased
  adjective (masculine)
  Past Passive Participle
  From root i with prefix vi-
  Prefix: vi
  Root: i (class 2)
• rāga – color, passion, attachment, desire
  noun (masculine)

निरायासः (nirāyāsaḥ) - without effort, effortless, free from trouble

(adjective)

Nominative, masculine, singular of nirāyāsa

nirāyāsa - free from effort, effortless

Compound type : nañ-bahuvrīhi (nis+āyāsa)

• nis – out, without, free from
  indeclinable
• āyāsa – effort, exertion, trouble, fatigue
  noun (masculine)

शान्तः (śāntaḥ) - peaceful, calm, tranquil, quieted

(adjective)

Nominative, masculine, singular of śānta

śānta - calmed, tranquil, peaceful

Past Passive Participle

From root śam

Root: śam (class 4)

तिष्ठति (tiṣṭhati) - stands, remains, abides, exists

(verb)

3rd person , singular, active, present indicative (laṭ) of sthā

Root: sthā (class 1)

बुद्ध-धीः (buddha-dhīḥ) - one with awakened intellect/mind

(adjective)

Nominative, masculine, singular of buddha-dhī

buddha-dhī - one whose intellect is awakened, having an awakened mind

Compound type : bahuvrīhi (buddha+dhī)

• buddha – awakened, enlightened, known, understood
  adjective (masculine)
  Past Passive Participle
  From root budh
  Root: budh (class 1)
• dhī – intellect, understanding, mind, thought
  noun (feminine)