महाभारतः mahābhārataḥ - book-3, chapter-40, verse-44

ततः शक्राशनिसमैर्मुष्टिभिर्भृशदारुणैः ।
किरातरूपी भगवानर्दयामास फल्गुनम् ॥४४॥

44. tataḥ śakrāśanisamairmuṣṭibhirbhṛśadāruṇaiḥ ,
kirātarūpī bhagavānardayāmāsa phalgunam.

44. tataḥ śakrāśanisamaiḥ muṣṭibhiḥ bhṛśadāruṇaiḥ
kirātarūpī bhagavān ardayāmāsa phalgunam

44. Then, the Lord (Śiva), disguised as a Kirāta, tormented Arjuna with exceedingly fierce fists that were comparable to Indra's thunderbolt.

Words meanings summery:

• ततः (tataḥ) - Then, thereupon

• शक्राशनिसमैः (śakrāśanisamaiḥ) - Like Indra's thunderbolt

• मुष्टिभिः (muṣṭibhiḥ) - With fists

• भृशदारुणैः (bhṛśadāruṇaiḥ) - Exceedingly terrible/fierce

• किरातरूपी (kirātarūpī) - In the form of a Kirāta

• भगवान् (bhagavān) - The Lord (Śiva) (The Lord, venerable one)

• अर्दयामास (ardayāmāsa) - He tormented, he oppressed

• फल्गुनम् (phalgunam) - Arjuna

Words meanings and morphology

ततः (tataḥ) - Then, thereupon

(indeclinable)

शक्राशनिसमैः (śakrāśanisamaiḥ) - Like Indra's thunderbolt

(adjective)

Instrumental, masculine, plural of śakrāśanisama

śakrāśanisama - Equal to Indra's thunderbolt, like Indra's thunderbolt

Compound type : tatpuruṣa (śakra+aśani+sama)

• śakra – Indra
  proper noun (masculine)
• aśani – thunderbolt, lightning, thunder
  noun (masculine)
• sama – like, similar, equal, same
  adjective

मुष्टिभिः (muṣṭibhiḥ) - With fists

(noun)

Instrumental, masculine, plural of muṣṭi

muṣṭi - Fist, handful, grip

भृशदारुणैः (bhṛśadāruṇaiḥ) - Exceedingly terrible/fierce

(adjective)

Instrumental, masculine, plural of bhṛśadāruṇa

bhṛśadāruṇa - Very terrible, exceedingly cruel or fierce

Compound type : karmadhāraya (bhṛśa+dāruṇa)

• bhṛśa – very, exceedingly, much
  indeclinable
• dāruṇa – terrible, fierce, dreadful, cruel
  adjective

किरातरूपी (kirātarūpī) - In the form of a Kirāta

(adjective)

Nominative, masculine, singular of kirātarūpin

kirātarūpin - Having the form of a Kirāta, appearing as a Kirāta

Compound type : bahuvrīhi (kirāta+rūpin)

• kirāta – a wild mountaineer tribe, a Kirāta
  noun (masculine)
• rūpin – having the form of, appearing as, embodied as
  adjective

भगवान् (bhagavān) - The Lord (Śiva) (The Lord, venerable one)

(noun)

Nominative, masculine, singular of bhagavat

bhagavat - Fortunate, glorious, venerable, divine, the Lord

अर्दयामास (ardayāmāsa) - He tormented, he oppressed

(verb)

3rd person , singular, active, Perfect (Lit) of ard

Causative, Periphrastic Perfect

Formed from causative stem `arday-` with `āmāsa` (Perfect of `as` + `ām` suffix)

Root: ard (class 10)

फल्गुनम् (phalgunam) - Arjuna

(proper noun)

Accusative, masculine, singular of phalguna

phalguna - Arjuna (a name of Arjuna)