योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-75, verse-6

नमुचिर्दानवाधीशो देवद्वन्द्वपरः सदा ।
नानाचारविचारेषु क्वचिन्नान्तरतप्यत ॥ ६ ॥

namucirdānavādhīśo devadvandvaparaḥ sadā ,
nānācāravicāreṣu kvacinnāntaratapyata 6

6. namuciḥ dānava-adhīśaḥ deva-dvandva-paraḥ sadā
nānā-ācāra-vicāreṣu kvacit na antar atapyata

6. dānava-adhīśaḥ namuciḥ sadā deva-dvandva-paraḥ
nānā-ācāra-vicāreṣu kvacit antar na atapyata

6. Namuci, the lord of the Danavas, always intent on opposing the gods, never felt internal distress (antar) amidst his various customs and deliberations.

Words meanings summery:

• नमुचिः (namuciḥ) - Namuci (a demon king)

• दानव-अधीशः (dānava-adhīśaḥ) - lord of the Danavas (a class of demons)

• देव-द्वन्द्व-परः (deva-dvandva-paraḥ) - devoted to conflict/opposition with the gods

• सदा (sadā) - always, constantly

• नाना-आचार-विचारेषु (nānā-ācāra-vicāreṣu) - in various customs and considerations/deliberations

• क्वचित् (kvacit) - sometimes, ever, somewhere, in some case

• न (na) - not, no

• अन्तर् (antar) - within, internally, in the heart

• अतप्यत (atapyata) - was distressed, suffered, grieved, tormented

Words meanings and morphology

नमुचिः (namuciḥ) - Namuci (a demon king)

(proper noun)

Nominative, masculine, singular of namuci

namuci - Namuci (name of a demon slain by Indra)

दानव-अधीशः (dānava-adhīśaḥ) - lord of the Danavas (a class of demons)

(noun)

Nominative, masculine, singular of dānavādhīśa

dānavādhīśa - lord of the Dānavas

Compound type : Tatpuruṣa (dānava+adhīśa)

• dānava – descendant of Danu, a class of demons/giants
  noun (masculine)
• adhīśa – lord, master, ruler
  noun (masculine)
  From root īś with prefix adhi
  Prefix: adhi
  Root: īś (class 2)

देव-द्वन्द्व-परः (deva-dvandva-paraḥ) - devoted to conflict/opposition with the gods

(adjective)

Nominative, masculine, singular of devadvandvapara

devadvandvapara - one who is devoted to opposition/conflict with the gods

Compound type : Tatpuruṣa (deva+dvandva+para)

• deva – god, deity
  noun (masculine)
  Root: div (class 4)
• dvandva – pair, couple, conflict, antagonism
  noun (neuter)
• para – devoted to, intent on, supreme, other
  adjective

सदा (sadā) - always, constantly

(indeclinable)

नाना-आचार-विचारेषु (nānā-ācāra-vicāreṣu) - in various customs and considerations/deliberations

(noun)

Locative, masculine, plural of nānācāravicāra

nānācāravicāra - various customs and deliberations

Compound type : Dvandva (nānā+ācāra+vicāra)

• nānā – various, diverse
  indeclinable
• ācāra – custom, conduct, practice, tradition
  noun (masculine)
  From root car with prefix ā
  Prefix: ā
  Root: car (class 1)
• vicāra – consideration, deliberation, thought, investigation
  noun (masculine)
  From root car with prefix vi
  Prefix: vi
  Root: car (class 1)

क्वचित् (kvacit) - sometimes, ever, somewhere, in some case

(indeclinable)

न (na) - not, no

(indeclinable)

अन्तर् (antar) - within, internally, in the heart

(indeclinable)

अतप्यत (atapyata) - was distressed, suffered, grieved, tormented

(verb)

3rd person , singular, middle, past imperfect (laṅ) of tap

Root: tap (class 1)