महाभारतः mahābhārataḥ - book-1, chapter-19, verse-4

सत्त्वैश्च बहुसाहस्रैर्नानारूपैः समावृतम् ।
उग्रैर्नित्यमनाधृष्यं कूर्मग्राहसमाकुलम् ॥४॥

4. sattvaiśca bahusāhasrairnānārūpaiḥ samāvṛtam ,
ugrairnityamanādhṛṣyaṁ kūrmagrāhasamākulam.

4. sattvaiḥ ca bahusāhasraiḥ nānārūpaiḥ samāvṛtam
ugraiḥ nityam anādhṛṣyam kūrmagrāhasamākulam

4. And it was completely enveloped by many thousands of creatures of diverse forms, (some of them) fierce, making it perpetually unassailable, and agitated with tortoises and alligators.

Words meanings summery:

• सत्त्वैः (sattvaiḥ) - by creatures (by beings, by creatures)

• च (ca) - and

• बहुसाहस्रैः (bahusāhasraiḥ) - by many thousands

• नानारूपैः (nānārūpaiḥ) - by those of diverse forms (by those of various forms)

• समावृतम् (samāvṛtam) - completely enveloped (completely covered, thoroughly surrounded)

• उग्रैः (ugraiḥ) - by fierce (creatures) (by fierce ones, by terrible ones)

• नित्यम् (nityam) - perpetually (perpetually, constantly, always)

• अनाधृष्यम् (anādhṛṣyam) - unassailable (unassailable, unconquerable, inviolable)

• कूर्मग्राहसमाकुलम् (kūrmagrāhasamākulam) - agitated with tortoises and alligators (agitated with tortoises and crocodiles/grahas)

Words meanings and morphology

सत्त्वैः (sattvaiḥ) - by creatures (by beings, by creatures)

(noun)

Instrumental, masculine, plural of sattva

sattva - being, creature, essence, reality, goodness, courage

From root `as` (to be) + `tva` suffix.

Root: as (class 2)

Note: Agent for `samāvṛtam`.

च (ca) - and

(indeclinable)

Conjunction.

बहुसाहस्रैः (bahusāhasraiḥ) - by many thousands

(adjective)

Instrumental, masculine, plural of bahusāhasra

bahusāhasra - consisting of many thousands, numerous

Compound

Compound type : karmadhāraya (bahu+sāhasra)

• bahu – much, many, numerous
  adjective (masculine)
• sāhasra – consisting of a thousand, thousandfold
  adjective (masculine)
  From `sahasra` (thousand)

Note: Modifies `sattvaiḥ`.

नानारूपैः (nānārūpaiḥ) - by those of diverse forms (by those of various forms)

(adjective)

Instrumental, masculine, plural of nānārūpa

nānārūpa - of various forms, diverse in appearance

Compound

Compound type : karmadhāraya (nānā+rūpa)

• nānā – various, diverse, manifold
  indeclinable
• rūpa – form, shape, appearance, beauty
  noun (neuter)

Note: Modifies `sattvaiḥ`.

समावृतम् (samāvṛtam) - completely enveloped (completely covered, thoroughly surrounded)

(adjective)

Accusative, masculine, singular of samāvṛta

samāvṛta - thoroughly covered, completely surrounded, well-covered

past passive participle

From `sam` + `ā` + root `vṛ` (to cover).

Prefixes: sam+ā

Root: vṛ (class 5)

Note: Modifies `samudram` (from previous verse).

उग्रैः (ugraiḥ) - by fierce (creatures) (by fierce ones, by terrible ones)

(adjective)

Instrumental, masculine, plural of ugra

ugra - fierce, dreadful, powerful, formidable

Note: Modifies `sattvaiḥ` implicitly.

नित्यम् (nityam) - perpetually (perpetually, constantly, always)

(indeclinable)

Note: Adverb modifying `anādhṛṣyam`.

अनाधृष्यम् (anādhṛṣyam) - unassailable (unassailable, unconquerable, inviolable)

(adjective)

Accusative, masculine, singular of anādhṛṣya

anādhṛṣya - not to be assailed, unconquerable, unapproachable, inviolable

potential passive participle

From `a` (negation) + `ādhṛṣya` (assailable, from `ā` + root `dhṛṣ` + `ya`).

Compound type : nañ-tatpuruṣa (a+ādhṛṣya)

• a – not, un-
  indeclinable
  Negative prefix
• ādhṛṣya – assailable, approachable
  adjective
  potential passive participle
  From `ā` + root `dhṛṣ` (to be bold, attack) + `ya` suffix.
  Prefix: ā
  Root: dhṛṣ (class 5)

Note: Modifies `samudram`.

कूर्मग्राहसमाकुलम् (kūrmagrāhasamākulam) - agitated with tortoises and alligators (agitated with tortoises and crocodiles/grahas)

(adjective)

Accusative, masculine, singular of kūrmagrāhasamākula

kūrmagrāhasamākula - filled with, or agitated by, tortoises and 'grahas' (large aquatic animals like crocodiles, sharks, or mythical monsters)

Compound

Compound type : tatpuruṣa (kūrmagrāha+samākula)

• kūrmagrāha – tortoises and grahas
  noun (masculine)
  Dvandva compound
• samākula – filled, agitated, crowded
  adjective
  past passive participle
  From `sam` + `ā` + root `kul` (to crowd, be agitated).
  Prefixes: sam+ā
  Root: kul (class 10)

Note: Modifies `samudram`.