महाभारतः mahābhārataḥ - book-12, chapter-86, verse-29

धर्मार्थशास्त्रतत्त्वज्ञः संधिविग्रहको भवेत् ।
मतिमान्धृतिमान्धीमान्रहस्यविनिगूहिता ॥२९॥

29. dharmārthaśāstratattvajñaḥ saṁdhivigrahako bhavet ,
matimāndhṛtimāndhīmānrahasyavinigūhitā.

29. dharmārthaśāstratattvajñaḥ sandhivigrahakaḥ
bhavet matimān dhṛtimān dhīmān rahasyavinigūhitā

29. (Saḥ) dharmārthaśāstratattvajñaḥ,
saṃdhivigrahakaḥ bhavet.
(Saḥ) matimān,
dhṛtimān,
dhīmān,
rahasyavinigūhitā (syāt).

29. He should be knowledgeable in the principles of justice (dharma) and economics (artha), and be capable of handling peace and war. He should be intelligent, resolute, wise, and a keeper of secrets.

Words meanings summery:

• धर्मार्थशास्त्रतत्त्वज्ञः (dharmārthaśāstratattvajñaḥ) - knowledgeable in the fundamental principles of ethics, law (dharma) and statecraft, economics (artha) (one who knows the essence of the sciences of dharma and artha)

• सन्धिविग्रहकः (sandhivigrahakaḥ) - skilled in diplomacy concerning alliances and conflicts (one who handles peace and war, diplomat, foreign minister)

• भवेत् (bhavet) - should be (possessing these qualities) (may be, should be, would be)

• मतिमान् (matimān) - possessing intelligence (intelligent, wise, thoughtful)

• धृतिमान् (dhṛtimān) - having strong resolve and fortitude (resolute, firm, persevering, courageous)

• धीमान् (dhīmān) - highly discerning and perceptive (wise, intelligent, sagacious)

• रहस्यविनिगूहिता (rahasyavinigūhitā) - someone trustworthy with confidential information (one who conceals secrets well, a good keeper of secrets)

Words meanings and morphology

धर्मार्थशास्त्रतत्त्वज्ञः (dharmārthaśāstratattvajñaḥ) - knowledgeable in the fundamental principles of ethics, law (dharma) and statecraft, economics (artha) (one who knows the essence of the sciences of dharma and artha)

(adjective)

Nominative, masculine, singular of dharmārthaśāstratattvajña

dharmārthaśāstratattvajña - one who knows the essence of the sciences of dharma and artha

Compound type : tatpuruṣa (dharma+artha+śāstra+tattva+jña)

• dharma – natural law, constitution, intrinsic nature, duty, righteousness
  noun (masculine)
  Root: dhṛ (class 1)
• artha – purpose, meaning, wealth, economics, statecraft
  noun (masculine)
  Root: ṛ
• śāstra – treatise, scripture, science, rule
  noun (neuter)
  root śās + stra
  Root: śās (class 2)
• tattva – truth, reality, essence, principle
  noun (neuter)
  tad + tva
• jña – knowing, knower of
  adjective (masculine)
  root jñā + ka
  Root: jñā (class 9)

Note: Qualifies the implied subject (the diplomat/messenger).

सन्धिविग्रहकः (sandhivigrahakaḥ) - skilled in diplomacy concerning alliances and conflicts (one who handles peace and war, diplomat, foreign minister)

(noun)

Nominative, masculine, singular of sandhivigrahaka

sandhivigrahaka - one who conducts peace and war, a diplomat, foreign minister

sandhi + vigraha + ka

Compound type : dvandva (sandhi+vigraha)

• sandhi – union, peace, alliance, treaty
  noun (masculine)
  sam-dhā + ki
  Prefix: sam
  Root: dhā (class 3)
• vigraha – separation, war, conflict, dispute
  noun (masculine)
  vi-grah + a
  Prefix: vi
  Root: grah (class 9)

Note: Also serves as an adjective here.

भवेत् (bhavet) - should be (possessing these qualities) (may be, should be, would be)

(verb)

3rd person , singular, active, optative (vidhi-liṅ) of bhū

Optative Mood

Present Tense, Parasmaipada, 3rd Person, Singular

Root: bhū (class 1)

मतिमान् (matimān) - possessing intelligence (intelligent, wise, thoughtful)

(adjective)

Nominative, masculine, singular of matimat

matimat - intelligent, wise, thoughtful, sagacious

mati + matup

Root: man (class 4)

धृतिमान् (dhṛtimān) - having strong resolve and fortitude (resolute, firm, persevering, courageous)

(adjective)

Nominative, masculine, singular of dhṛtimat

dhṛtimat - resolute, firm, steady, patient, courageous

dhṛti + matup

Root: dhṛ (class 1)

धीमान् (dhīmān) - highly discerning and perceptive (wise, intelligent, sagacious)

(adjective)

Nominative, masculine, singular of dhīmat

dhīmat - intelligent, wise, thoughtful, sagacious

dhī + matup

Root: dhyai (class 1)

रहस्यविनिगूहिता (rahasyavinigūhitā) - someone trustworthy with confidential information (one who conceals secrets well, a good keeper of secrets)

(noun)

Nominative, masculine, singular of rahasyavinigūhitṛ

rahasyavinigūhitṛ - one who completely conceals secrets

rahasya + vi-ni-guh + tṛc

Compound type : upapada-tatpuruṣa (rahasya+vinigūhitṛ)

• rahasya – secret, mystery, confidential matter
  noun (neuter)
• vinigūhitṛ – one who conceals thoroughly
  noun (masculine)
  vi-ni-guh + tṛc
  Prefixes: vi+ni
  Root: guh (class 1)