महाभारतः mahābhārataḥ - book-12, chapter-126, verse-51

एवं त्वमपि कौन्तेय श्रुत्वा वाणीमिमां मम ।
स्थिरो भव यथा राजन्हिमवानचलोत्तमः ॥५१॥

51. evaṁ tvamapi kaunteya śrutvā vāṇīmimāṁ mama ,
sthiro bhava yathā rājanhimavānacalottamaḥ.

51. evam tvam api kaunteya śrutvā vāṇīm imām mama
sthiraḥ bhava yathā rājan himavān acalottamaḥ

51. kaunteya rājan evam tvam api mama imām vāṇīm
śrutvā himavān acalottamaḥ yathā sthiraḥ bhava

51. Therefore, O son of Kunti (Kaunteya), having heard this speech of mine, become firm, O King, just like the Himalayas, the foremost among mountains.

Words meanings summery:

• एवम् (evam) - thus, in this way, so

• त्वम् (tvam) - you

• अपि (api) - also, even, too

• कौन्तेय (kaunteya) - Addressed to a Pandava prince, typically Arjuna or Yudhishthira (O son of Kunti)

• श्रुत्वा (śrutvā) - having heard

• वाणीम् (vāṇīm) - speech, word, instruction

• इमाम् (imām) - referring to the speech (vāṇīm) (this)

• मम (mama) - Referring to Bhishma's speech (my, of me)

• स्थिरः (sthiraḥ) - firm, steady, stable

• भव (bhava) - be, become

• यथा (yathā) - just as, as, like

• राजन् (rājan) - Addressed to Yudhishthira (O King)

• हिमवान् (himavān) - The Himālaya mountain range (the Himalayas, snowy)

• अचलोत्तमः (acalottamaḥ) - the best of mountains, supreme mountain

Words meanings and morphology

एवम् (evam) - thus, in this way, so

(indeclinable)

त्वम् (tvam) - you

(pronoun)

Nominative, singular of yuṣmad

yuṣmad - you (plural and singular)

अपि (api) - also, even, too

(indeclinable)

कौन्तेय (kaunteya) - Addressed to a Pandava prince, typically Arjuna or Yudhishthira (O son of Kunti)

(proper noun)

Vocative, masculine, singular of kaunteya

kaunteya - son of Kunti

patronymic derivative from Kunti

श्रुत्वा (śrutvā) - having heard

(indeclinable)

absolutive

formed with suffix -tvā

Root: śru (class 5)

वाणीम् (vāṇīm) - speech, word, instruction

(noun)

Accusative, feminine, singular of vāṇī

vāṇī - speech, voice, word, instruction

इमाम् (imām) - referring to the speech (vāṇīm) (this)

(pronoun)

Accusative, feminine, singular of idam

idam - this, this one

मम (mama) - Referring to Bhishma's speech (my, of me)

(pronoun)

Genitive, singular of asmad

asmad - I, we

स्थिरः (sthiraḥ) - firm, steady, stable

(adjective)

Nominative, masculine, singular of sthira

sthira - firm, steady, stable, unmoving

from root sthā- (to stand)

Root: sthā (class 1)

भव (bhava) - be, become

(verb)

2nd person , singular, active, imperative (loṭ) of bhū

imperative

2nd person singular, imperative active

Root: bhū (class 1)

यथा (yathā) - just as, as, like

(indeclinable)

राजन् (rājan) - Addressed to Yudhishthira (O King)

(noun)

Vocative, masculine, singular of rājan

rājan - king, ruler

हिमवान् (himavān) - The Himālaya mountain range (the Himalayas, snowy)

(proper noun)

Nominative, masculine, singular of himavat

himavat - snowy, covered with snow; the Himalayas

from hima (snow) + matup suffix

अचलोत्तमः (acalottamaḥ) - the best of mountains, supreme mountain

(noun)

Nominative, masculine, singular of acalottama

acalottama - best of mountains

Compound type : tatpuruṣa (acala+uttama)

• acala – mountain, immovable, stationary
  noun (masculine)
  a (negation) + cala (moving)
• uttama – best, supreme, highest
  adjective (masculine)
  superlative of ud (up)