महाभारतः mahābhārataḥ - book-5, chapter-161, verse-3

भीमसेनादिभिर्गुप्तां सार्जुनैश्च महारथैः ।
धृष्टद्युम्नवशां दुर्गां सागरस्तिमितोपमाम् ॥३॥

3. bhīmasenādibhirguptāṁ sārjunaiśca mahārathaiḥ ,
dhṛṣṭadyumnavaśāṁ durgāṁ sāgarastimitopamām.

3. bhīmasenādibhiḥ guptām sārjunaiḥ ca mahārathaiḥ
dhṛṣṭadyumnavaśām durgām sāgarastimitopamām

3. (tām senām) bhīmasenādibhiḥ ca sārjunaiḥ mahārathaiḥ guptām,
dhṛṣṭadyumnavaśām,
durgām,
sāgarastimitopamām (niryāpayāmāsa).

3. It was protected by Bhīmasena and others, as well as by Arjuna and other great chariot-warriors, under the command of Dhṛṣṭadyumna, impregnable, and resembling the calm of an ocean.

Words meanings summery:

• भीमसेनादिभिः (bhīmasenādibhiḥ) - by Bhīmasena and others

• गुप्ताम् (guptām) - protected, guarded, preserved

• सार्जुनैः (sārjunaiḥ) - with Arjuna, accompanied by Arjuna

• च (ca) - and, also

• महारथैः (mahārathaiḥ) - by great chariot-warriors

• धृष्टद्युम्नवशाम् (dhṛṣṭadyumnavaśām) - subject to Dhṛṣṭadyumna, under the control of Dhṛṣṭadyumna

• दुर्गाम् (durgām) - difficult to conquer, impregnable, inaccessible

• सागरस्तिमितोपमाम् (sāgarastimitopamām) - resembling the calm of an ocean

Words meanings and morphology

भीमसेनादिभिः (bhīmasenādibhiḥ) - by Bhīmasena and others

(noun)

Instrumental, masculine, plural of bhīmasenādi

bhīmasenādi - Bhīmasena and others

Compound type : dvandva / tatpurusha (bhīmasena+ādi)

• bhīmasena – Bhīmasena (the second Pāṇḍava brother)
  proper noun (masculine)
• ādi – beginning, and so on, others
  noun (masculine)

Note: Agent of the passive participle guptām.

गुप्ताम् (guptām) - protected, guarded, preserved

(participle)

Accusative, feminine, singular of guptā

gupta - protected, guarded, hidden, secret

Past Passive Participle

From root √gup (to protect, to hide) + kta suffix.

Root: gup (class 1)

Note: Agrees with senām.

सार्जुनैः (sārjunaiḥ) - with Arjuna, accompanied by Arjuna

(adjective)

Instrumental, masculine, plural of sārjuna

sārjuna - with Arjuna

Compound type : bahuvrihi (sa+arjuna)

• sa – with, together
  indeclinable
• arjuna – Arjuna (the third Pāṇḍava brother)
  proper noun (masculine)

Note: Agrees with mahārathaiḥ.

च (ca) - and, also

(indeclinable)

Note: Conjunction.

महारथैः (mahārathaiḥ) - by great chariot-warriors

(noun)

Instrumental, masculine, plural of mahāratha

mahāratha - great warrior, mighty charioteer

Compound type : karmadhāraya (mahā+ratha)

• mahā – great, mighty
  adjective
• ratha – chariot; warrior in a chariot
  noun (masculine)

Note: Agent of the passive participle guptām, along with bhīmasenādibhiḥ.

धृष्टद्युम्नवशाम् (dhṛṣṭadyumnavaśām) - subject to Dhṛṣṭadyumna, under the control of Dhṛṣṭadyumna

(adjective)

Accusative, feminine, singular of dhṛṣṭadyumnavaśā

dhṛṣṭadyumnavaśa - under the control of Dhṛṣṭadyumna

Compound type : tatpurusha (dhṛṣṭadyumna+vaśa)

• dhṛṣṭadyumna – Dhṛṣṭadyumna (commander-in-chief of the Pāṇḍava army)
  proper noun (masculine)
• vaśa – control, sway, power
  noun (masculine)

Note: Agrees with senām.

दुर्गाम् (durgām) - difficult to conquer, impregnable, inaccessible

(adjective)

Accusative, feminine, singular of durgā

durga - difficult to go, inaccessible, impregnable

From dur (difficult) + √gam (to go).

Prefix: dur

Root: gam (class 1)

Note: Agrees with senām.

सागरस्तिमितोपमाम् (sāgarastimitopamām) - resembling the calm of an ocean

(adjective)

Accusative, feminine, singular of sāgarastimitopamā

sāgarastimitopama - like the calm of the ocean

Compound type : tatpurusha/karmadharaya (sāgara+stimita+upamā)

• sāgara – ocean, sea
  noun (masculine)
• stimita – calm, tranquil, motionless, steady
  adjective (masculine)
  Past Passive Participle
  From root √stim (to be firm, to be moist).
  Root: stim (class 1)
• upamā – comparison, resemblance, simile
  noun (feminine)
  From upasarga upa + root √mā (to measure).
  Prefix: upa
  Root: mā (class 3)

Note: Agrees with senām.