महाभारतः mahābhārataḥ - book-5, chapter-122, verse-49

अजेयो ह्यर्जुनः क्रुद्धः सर्वैरपि सुरासुरैः ।
मानुषैरपि गन्धर्वैर्मा युद्धे चेत आधिथाः ॥४९॥

49. ajeyo hyarjunaḥ kruddhaḥ sarvairapi surāsuraiḥ ,
mānuṣairapi gandharvairmā yuddhe ceta ādhithāḥ.

49. ajeyaḥ hi arjunaḥ kruddhaḥ sarvaiḥ api surāsuraiḥ
mānuṣaiḥ api gandharvaiḥ mā yuddhe cetaḥ ādithāḥ

49. Indeed, Arjuna, when enraged, is unconquerable even by all gods and asuras, and even by humans and Gandharvas. Do not set your mind on battle.

Words meanings summery:

• अजेयः (ajeyaḥ) - unconquerable, invincible, not to be subdued

• हि (hi) - indeed, surely, because

• अर्जुनः (arjunaḥ) - Arjuna (name of a Pandava prince)

• क्रुद्धः (kruddhaḥ) - enraged, angry, furious

• सर्वैः (sarvaiḥ) - by all, by everyone

• अपि (api) - even, also, too

• सुरासुरैः (surāsuraiḥ) - by gods and asuras

• मानुषैः (mānuṣaiḥ) - by humans, by men

• अपि (api) - even, also, too

• गन्धर्वैः (gandharvaiḥ) - by Gandharvas (celestial musicians)

• मा (mā) - Used as a prohibitive particle with Aorist (luṅ) to express a negative command. (do not, not)

• युद्धे (yuddhe) - in battle, in war

• चेतः (cetaḥ) - mind, thought, intellect

• आदिथाः (ādithāḥ) - You (should) fix your mind (on battle). (you should place, you should set, you should fix)

Words meanings and morphology

अजेयः (ajeyaḥ) - unconquerable, invincible, not to be subdued

(adjective)

Nominative, masculine, singular of ajeya

ajeya - unconquerable, invincible, not to be subdued, unconquered

Gerundive (kṛtya) or Potential Participle

Derived from root 'ji' (to conquer) with the suffix '-ya' (kṛtya) and the negative prefix 'a-'

Compound type : nañ-tatpuruṣa (a+jeya)

• a – not, non-
  indeclinable
  Negative prefix
• jeya – to be conquered, conquerable
  adjective (masculine)
  Gerundive
  Derived from root 'ji' with suffix '-ya'
  Root: ji (class 1)

हि (hi) - indeed, surely, because

(indeclinable)

अर्जुनः (arjunaḥ) - Arjuna (name of a Pandava prince)

(proper noun)

Nominative, masculine, singular of arjuna

arjuna - Arjuna (name), white, clear, shining

क्रुद्धः (kruddhaḥ) - enraged, angry, furious

(adjective)

Nominative, masculine, singular of kruddha

kruddha - enraged, angry, furious

Past Passive Participle

Derived from root 'krudh' with suffix '-ta'

Root: krudh (class 4)

सर्वैः (sarvaiḥ) - by all, by everyone

(pronoun)

Instrumental, masculine, plural of sarva

sarva - all, every, whole, complete

अपि (api) - even, also, too

(indeclinable)

सुरासुरैः (surāsuraiḥ) - by gods and asuras

(noun)

Instrumental, masculine, plural of surāsura

surāsura - gods and asuras (demons)

Compound type : dvandva (sura+asura)

• sura – god, deity
  noun (masculine)
• asura – demon, anti-god
  noun (masculine)

मानुषैः (mānuṣaiḥ) - by humans, by men

(noun)

Instrumental, masculine, plural of mānuṣa

mānuṣa - human, man, mankind, human being

Derived from 'manu' with 'a' suffix

अपि (api) - even, also, too

(indeclinable)

गन्धर्वैः (gandharvaiḥ) - by Gandharvas (celestial musicians)

(noun)

Instrumental, masculine, plural of gandharva

gandharva - Gandharva (a class of celestial beings, often musicians)

मा (mā) - Used as a prohibitive particle with Aorist (luṅ) to express a negative command. (do not, not)

(indeclinable)

Prohibitive particle

युद्धे (yuddhe) - in battle, in war

(noun)

Locative, neuter, singular of yuddha

yuddha - battle, fight, war, combat

Past Passive Participle (from yudh) used as a noun

Derived from root 'yudh' (to fight)

Root: yudh (class 4)

चेतः (cetaḥ) - mind, thought, intellect

(noun)

Accusative, neuter, singular of cetas

cetas - mind, intellect, consciousness, heart, understanding

From root 'cit' (to perceive, understand)

Root: cit (class 1)

Note: Can also be nominative singular, but here it's the object of the verb 'ādithāḥ'.

आदिथाः (ādithāḥ) - You (should) fix your mind (on battle). (you should place, you should set, you should fix)

(verb)

2nd person , singular, middle, aorist (luṅ) of dhā

Aorist

2nd person singular, Aorist (luṅ), Middle Voice, used here with prohibitive 'mā' particle. Root with prefix 'ā'.

Prefix: ā

Root: dhā (class 3)

Note: Used here in an injunctive sense (negative command) with 'mā'.