महाभारतः mahābhārataḥ - book-7, chapter-87, verse-50

शकैश्चापि समेष्यामि शक्रतुल्यपराक्रमैः ।
अग्निकल्पैर्दुराधर्षैः प्रदीप्तैरिव पावकैः ॥५०॥

50. śakaiścāpi sameṣyāmi śakratulyaparākramaiḥ ,
agnikalpairdurādharṣaiḥ pradīptairiva pāvakaiḥ.

50. śakaiḥ ca api sameṣyāmi śakratulyaparākramaiḥ
agnikalpaiḥ durādharṣaiḥ pradīptaiḥ iva pāvakair

50. aham śakaiḥ ca api sameṣyāmi (ye) śakratulyaparākramaiḥ
agnikalpaiḥ durādharṣaiḥ pradīptaiḥ pāvakair iva (santi)

50. I will also confront the Śakas, whose valor rivals Indra's (Śakra), who are like fire, unassailable, and as resplendent as blazing flames.

Words meanings summery:

• शकैः (śakaiḥ) - by the Śakas (a tribal people/warriors)

• च (ca) - and, also

• अपि (api) - also, even, too

• समेष्यामि (sameṣyāmi) - I will meet, I will confront

• शक्रतुल्यपराक्रमैः (śakratulyaparākramaiḥ) - by those whose valor is equal to Indra's

• अग्निकल्पैः (agnikalpaiḥ) - by those like fire, fire-like

• दुराधर्षैः (durādharṣaiḥ) - by the irresistible, by the unassailable

• प्रदीप्तैः (pradīptaiḥ) - by the blazing, by the resplendent

• इव (iva) - like, as, as if

• पावकैर् (pāvakair) - by fires, by purifiers

Words meanings and morphology

शकैः (śakaiḥ) - by the Śakas (a tribal people/warriors)

(noun)

Instrumental, masculine, plural of śaka

śaka - a Śaka (a specific tribe or group of people, often associated with Scythians)

च (ca) - and, also

(indeclinable)

अपि (api) - also, even, too

(indeclinable)

समेष्यामि (sameṣyāmi) - I will meet, I will confront

(verb)

1st person , singular, active, future (lṛṭ) of sam-iṣ

Prefix: sam

Root: iṣ (class 2)

शक्रतुल्यपराक्रमैः (śakratulyaparākramaiḥ) - by those whose valor is equal to Indra's

(adjective)

Instrumental, masculine, plural of śakratulyaparākrama

śakratulyaparākrama - having valor equal to Indra's

Compound type : bahuvrīhi (śakra+tulya+parākrama)

• śakra – Indra (name of a deity), powerful, mighty
  proper noun (masculine)
• tulya – equal, similar, comparable
  adjective (masculine)
• parākrama – valor, prowess, might, courage
  noun (masculine)

अग्निकल्पैः (agnikalpaiḥ) - by those like fire, fire-like

(adjective)

Instrumental, masculine, plural of agnikalpa

agnikalpa - resembling fire, fire-like

Compound type : bahuvrīhi (agni+kalpa)

• agni – fire, Agni (deity)
  noun (masculine)
• kalpa – like, resembling, similar to; a cosmic age
  adjective (masculine)

दुराधर्षैः (durādharṣaiḥ) - by the irresistible, by the unassailable

(adjective)

Instrumental, masculine, plural of durādharṣa

durādharṣa - difficult to assault or overcome, unassailable, invincible

verbal adjective (kṛtya)

Derived from root √dhṛṣ with prefixes dur and ā

Prefixes: dur+ā

Root: dhṛṣ (class 5)

प्रदीप्तैः (pradīptaiḥ) - by the blazing, by the resplendent

(adjective)

Instrumental, masculine, plural of pradīpta

pradīpta - lit, inflamed, blazing, resplendent, brilliant

Past Passive Participle

Prefix: pra

Root: dīp (class 4)

इव (iva) - like, as, as if

(indeclinable)

पावकैर् (pāvakair) - by fires, by purifiers

(noun)

Instrumental, masculine, plural of pāvaka

pāvaka - fire, purifying, pure; Agni