महाभारतः mahābhārataḥ - book-4, chapter-64, verse-36

मन्त्रयित्वा तु कौन्तेय उत्तरेण रहस्तदा ।
इतिकर्तव्यतां सर्वां राजन्यथ युधिष्ठिरे ॥३६॥

36. mantrayitvā tu kaunteya uttareṇa rahastadā ,
itikartavyatāṁ sarvāṁ rājanyatha yudhiṣṭhire.

36. mantrayitvā tu kaunteya uttareṇa rahas tadā
itikartavyatām sarvām rājan yathā yudhiṣṭhire

36. O King, then Kaunteya (Arjuna), after having secretly consulted with Uttara regarding the entire course of action, just as he would with Yudhiṣṭhira...

Words meanings summery:

• मन्त्रयित्वा (mantrayitvā) - having consulted, having advised

• तु (tu) - but, and, indeed

• कौन्तेय (kaunteya) - O Arjuna (O son of Kuntī)

• उत्तरेण (uttareṇa) - with Uttara

• रहस् (rahas) - in secret, secretly

• तदा (tadā) - then, at that time

• इतिकर्तव्यताम् (itikartavyatām) - the course of action, what is to be done, duty

• सर्वाम् (sarvām) - all, entire, whole

• राजन् (rājan) - O King (addressing Dhṛtarāṣṭra) (O king)

• यथा (yathā) - just as, how, in the manner that

• युधिष्ठिरे (yudhiṣṭhire) - with Yudhiṣṭhira (in Yudhiṣṭhira, with Yudhiṣṭhira (regarding))

Words meanings and morphology

मन्त्रयित्वा (mantrayitvā) - having consulted, having advised

(indeclinable)

Absolutive (Gerund)

Formed from the denominative verb 'mantr' (from 'mantra').

Root: mantr (class 10)

तु (tu) - but, and, indeed

(indeclinable)

कौन्तेय (kaunteya) - O Arjuna (O son of Kuntī)

(proper noun)

Vocative, masculine, singular of kaunteya

kaunteya - son of Kuntī (Arjuna)

Patronymic from Kuntī.

उत्तरेण (uttareṇa) - with Uttara

(proper noun)

Instrumental, masculine, singular of uttara

uttara - Uttara (name of Virāṭa's son)

रहस् (rahas) - in secret, secretly

(indeclinable)

तदा (tadā) - then, at that time

(indeclinable)

From pronominal base tad with -dā suffix.

इतिकर्तव्यताम् (itikartavyatām) - the course of action, what is to be done, duty

(noun)

Accusative, feminine, singular of itikartavyatā

itikartavyatā - course of action, what is to be done, duty, propriety

Compound type : avyayībhāva-tatpuruṣa (iti+kartavya+tā)

• iti – thus, in this manner, so
  indeclinable
• kartavya – to be done, proper to be done, duty
  adjective (neuter)
  Gerundive (future passive participle)
  Derived from verb root √kṛ.
  Root: kṛ (class 8)
• tā – suffix forming abstract feminine nouns
  suffix (feminine)

सर्वाम् (sarvām) - all, entire, whole

(adjective)

Accusative, feminine, singular of sarva

sarva - all, every, whole, complete

राजन् (rājan) - O King (addressing Dhṛtarāṣṭra) (O king)

(noun)

Vocative, masculine, singular of rājan

rājan - king, ruler

यथा (yathā) - just as, how, in the manner that

(indeclinable)

युधिष्ठिरे (yudhiṣṭhire) - with Yudhiṣṭhira (in Yudhiṣṭhira, with Yudhiṣṭhira (regarding))

(proper noun)

Locative, masculine, singular of yudhiṣṭhira

yudhiṣṭhira - Yudhiṣṭhira (name of the eldest Pāṇḍava)