महाभारतः mahābhārataḥ - book-3, chapter-209, verse-12

यस्तु न च्यवते नित्यं यशसा वर्चसा श्रिया ।
अग्निर्निश्च्यवनो नाम पृथिवीं स्तौति केवलम् ॥१२॥

12. yastu na cyavate nityaṁ yaśasā varcasā śriyā ,
agnirniścyavano nāma pṛthivīṁ stauti kevalam.

12. yaḥ tu na cyavate nityam yaśasā varcasā śriyā
agniḥ niścyavanaḥ nāma pṛthivīṁ stauti kevalam

12. He who indeed never deviates (cyavate) from fame, splendor, or prosperity, is Agni, named Niścyavana (the Undeviating One). He praises only the earth.

Words meanings summery:

• यः (yaḥ) - who, which

• तु (tu) - but, indeed, however, moreover

• न (na) - not, no

• च्यवते (cyavate) - he deviates, falls, moves from, is deprived of

• नित्यम् (nityam) - always, constantly, perpetually

• यशसा (yaśasā) - by fame, by glory

• वर्चसा (varcasā) - by splendor, by energy, by brilliance

• श्रिया (śriyā) - by prosperity, by wealth, by beauty

• अग्निः (agniḥ) - Agni (god of fire), fire

• निश्च्यवनः (niścyavanaḥ) - the Undeviating One (as a name/epithet) (undeviating, not falling, immovable, firm)

• नाम (nāma) - by name, indeed, namely

• पृथिवीं (pṛthivīṁ) - the earth

• स्तौति (stauti) - he praises, extols, lauds

• केवलम् (kevalam) - only, merely, solely, exclusively

Words meanings and morphology

यः (yaḥ) - who, which

(pronoun)

Nominative, masculine, singular of yad

yad - who, which, what

तु (tu) - but, indeed, however, moreover

(indeclinable)

न (na) - not, no

(indeclinable)

च्यवते (cyavate) - he deviates, falls, moves from, is deprived of

(verb)

3rd person , singular, middle, present indicative (laṭ) of cyu

Root: cyu (class 1)

नित्यम् (nityam) - always, constantly, perpetually

(indeclinable)

Adverbial form of nitya.

यशसा (yaśasā) - by fame, by glory

(noun)

Instrumental, neuter, singular of yaśas

yaśas - fame, glory, renown, celebrity

वर्चसा (varcasā) - by splendor, by energy, by brilliance

(noun)

Instrumental, neuter, singular of varcas

varcas - splendor, energy, virility, brilliance, vital power

श्रिया (śriyā) - by prosperity, by wealth, by beauty

(noun)

Instrumental, feminine, singular of śrī

śrī - prosperity, wealth, glory, beauty, well-being

अग्निः (agniḥ) - Agni (god of fire), fire

(proper noun)

Nominative, masculine, singular of agni

agni - Agni (the Vedic god of fire), fire

निश्च्यवनः (niścyavanaḥ) - the Undeviating One (as a name/epithet) (undeviating, not falling, immovable, firm)

(adjective)

Nominative, masculine, singular of niścyavana

niścyavana - undeviating, not falling, immovable, firm, steadfast

Compound type : nañ-tatpuruṣa (na+cyavana)

• na – not, no
  indeclinable
• cyavana – falling, deviating, moving
  noun (masculine/neuter)
  From root cyu (to fall, deviate).
  Root: cyu (class 1)

नाम (nāma) - by name, indeed, namely

(indeclinable)

Used adverbially.

पृथिवीं (pṛthivīṁ) - the earth

(noun)

Accusative, feminine, singular of pṛthivī

pṛthivī - earth, ground, world

स्तौति (stauti) - he praises, extols, lauds

(verb)

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

Root: stu (class 2)

केवलम् (kevalam) - only, merely, solely, exclusively

(indeclinable)