योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-109, verse-17

बाहू विश्लथतामीषन्निन्यतुस्तौ शनैः प्रियौ ।
अमृतापूर्णहृदयौ संशून्यहृदयोपमौ ॥ १७ ॥

bāhū viślathatāmīṣanninyatustau śanaiḥ priyau ,
amṛtāpūrṇahṛdayau saṃśūnyahṛdayopamau 17

17. bāhū viślathatām īṣat ninyatuḥ tau śanaiḥ
priyau amṛtāpūrṇa-hṛdayau saṃśūnya-hṛdayopamau

17. tau priyau amṛtāpūrṇa-hṛdayau saṃśūnya-hṛdayopamau
bāhū viślathatām īṣat śanaiḥ ninyatuḥ

17. Those two lovers, their hearts filled with nectar yet feeling as if utterly empty (of other desires), slowly loosened their arms a little.

Words meanings summery:

• बाहू (bāhū) - two arms

• विश्लथताम् (viślathatām) - looseness, slackness

• ईषत् (īṣat) - slightly, a little

• निन्यतुः (ninyatuḥ) - they led, they brought

• तौ (tau) - those two

• शनैः (śanaiḥ) - slowly, gradually

• प्रियौ (priyau) - the two beloved ones, the two lovers

• अमृतापूर्ण-हृदयौ (amṛtāpūrṇa-hṛdayau) - two whose hearts were full of nectar

• संशून्य-हृदयोपमौ (saṁśūnya-hṛdayopamau) - resembling hearts utterly empty (of worldly desires/thoughts) (two resembling hearts utterly empty)

Words meanings and morphology

बाहू (bāhū) - two arms

(noun)

Nominative, masculine, dual of bāhu

bāhu - arm, fore-arm

विश्लथताम् (viślathatām) - looseness, slackness

(noun)

Accusative, feminine, singular of viślathatā

viślathatā - looseness, slackness, languor

ईषत् (īṣat) - slightly, a little

(indeclinable)

निन्यतुः (ninyatuḥ) - they led, they brought

(verb)

3rd person , dual, active, past perfect (liṭ) of nī

Perfect Indicative

Liṭ (Perfect) third person dual active form.

Root: nī (class 1)

तौ (tau) - those two

(pronoun)

Nominative, masculine, dual of tad

tad - that, those

शनैः (śanaiḥ) - slowly, gradually

(indeclinable)

प्रियौ (priyau) - the two beloved ones, the two lovers

(noun)

Nominative, masculine, dual of priya

priya - dear, beloved, favorite, husband, lover

अमृतापूर्ण-हृदयौ (amṛtāpūrṇa-hṛdayau) - two whose hearts were full of nectar

(adjective)

Nominative, masculine, dual of amṛtāpūrṇa-hṛdaya

amṛtāpūrṇa-hṛdaya - whose hearts are filled with nectar

Compound type : bahuvrīhi (amṛta+āpūrṇa+hṛdaya)

• amṛta – nectar, immortality, elixir
  noun (neuter)
• āpūrṇa – full, filled, complete
  adjective (masculine)
  Past Passive Participle
  Derived from root `pṛ` (to fill) with prefix `ā`.
  Prefix: ā
  Root: pṛ (class 9)
• hṛdaya – heart, mind, soul
  noun (neuter)

संशून्य-हृदयोपमौ (saṁśūnya-hṛdayopamau) - resembling hearts utterly empty (of worldly desires/thoughts) (two resembling hearts utterly empty)

(adjective)

Nominative, masculine, dual of saṃśūnya-hṛdayopama

saṁśūnya-hṛdayopama - resembling hearts utterly empty, like a completely void heart

Compound type : bahuvrīhi (sam+śūnya+hṛdaya+upama)

• sam – completely, thoroughly, together
  indeclinable
• śūnya – empty, void, null, blank
  adjective (masculine)
• hṛdaya – heart, mind, soul
  noun (neuter)
• upama – similar, resembling, like
  adjective (masculine)