योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-98, verse-3

न नास्तिक्यान्न चास्तिक्यात्कष्टानुष्ठानवैदिकाः ।
मनोज्ञमधुराचाराः प्रियपेशलवादिनः ॥ ३ ॥

na nāstikyānna cāstikyātkaṣṭānuṣṭhānavaidikāḥ ,
manojñamadhurācārāḥ priyapeśalavādinaḥ 3

3. na nāstikyāt na ca āstikyāt kaṣṭānuṣṭhānavedikāḥ
manojñamadhurācārāḥ priyapeśalavādinaḥ

3. na nāstikyāt na ca āstikyāt kaṣṭānuṣṭhānavedikāḥ;
manojñamadhurācārāḥ; priyapeśalavādinaḥ

3. They are not defined by either disbelief or excessive belief, nor do they engage in difficult Vedic rites. Their conduct is pleasing and sweet, and their speech is kind and charming.

Words meanings summery:

• न (na) - not, nor, neither

• नास्तिक्यात् (nāstikyāt) - from disbelief, from atheism

• न (na) - not, nor, neither

• च (ca) - and, also

• आस्तिक्यात् (āstikyāt) - from belief, from theism

• कष्टानुष्ठानवेदिकाः (kaṣṭānuṣṭhānavedikāḥ) - those who perform difficult Vedic rites; having difficult Vedic observances

• मनोज्ञमधुराचाराः (manojñamadhurācārāḥ) - those whose conduct is pleasing and sweet; having pleasing and sweet behavior

• प्रियपेशलवादिनः (priyapeśalavādinaḥ) - those who speak pleasantly and charmingly; having pleasing and gentle speech

Words meanings and morphology

न (na) - not, nor, neither

(indeclinable)

नास्तिक्यात् (nāstikyāt) - from disbelief, from atheism

(noun)

Ablative, neuter, singular of nāstikya

nāstikya - atheism, disbelief, absence of belief

Derived from nāstika (disbeliever, atheist)

न (na) - not, nor, neither

(indeclinable)

च (ca) - and, also

(indeclinable)

आस्तिक्यात् (āstikyāt) - from belief, from theism

(noun)

Ablative, neuter, singular of āstikya

āstikya - theism, belief, existence of God/soul/future life

Derived from āstika (believer, theist)

कष्टानुष्ठानवेदिकाः (kaṣṭānuṣṭhānavedikāḥ) - those who perform difficult Vedic rites; having difficult Vedic observances

(adjective)

Nominative, masculine, plural of kaṣṭānuṣṭhānavedika

kaṣṭānuṣṭhānavedika - one whose Vedic practices involve difficult observances

Compound type : bahuvrīhi (kaṣṭa+anuṣṭhāna+vedika)

• kaṣṭa – difficult, painful, troublesome, bad
  adjective (neuter)
• anuṣṭhāna – performance, observance, practice, execution (especially of a religious rite)
  noun (neuter)
  Derived from anu-√sthā (to perform, observe)
  Prefix: anu
  Root: sthā (class 1)
• vedika – related to the Veda, Vedic, a student of the Veda
  adjective (masculine)
  Derived from Veda

मनोज्ञमधुराचाराः (manojñamadhurācārāḥ) - those whose conduct is pleasing and sweet; having pleasing and sweet behavior

(adjective)

Nominative, masculine, plural of manojñamadhurācāra

manojñamadhurācāra - one whose conduct is pleasing and sweet

Compound type : bahuvrīhi (manojña+madhura+ācāra)

• manojña – pleasing to the mind, agreeable, charming, beautiful
  adjective (neuter)
• madhura – sweet, pleasant, charming, melodious
  adjective (neuter)
• ācāra – conduct, custom, practice, behavior
  noun (masculine)
  Derived from ā-√car (to behave)
  Prefix: ā
  Root: car (class 1)

प्रियपेशलवादिनः (priyapeśalavādinaḥ) - those who speak pleasantly and charmingly; having pleasing and gentle speech

(adjective)

Nominative, masculine, plural of priyapeśalavādin

priyapeśalavādin - one who speaks pleasantly and charmingly

Compound type : bahuvrīhi (priya+peśala+vādin)

• priya – dear, beloved, pleasing, agreeable
  adjective (neuter)
• peśala – charming, graceful, soft, tender, beautiful
  adjective (neuter)
• vādin – speaking, speaker, one who says, advocating
  adjective (masculine)
  agent noun
  Derived from √vad (to speak) with suffix -in
  Root: vad (class 1)