महाभारतः mahābhārataḥ - book-12, chapter-137, verse-40

कृतवैरे न विश्वासः कार्यस्त्विह सुहृद्यपि ।
छन्नं संतिष्ठते वैरं गूढोऽग्निरिव दारुषु ॥४०॥

40. kṛtavaire na viśvāsaḥ kāryastviha suhṛdyapi ,
channaṁ saṁtiṣṭhate vairaṁ gūḍho'gniriva dāruṣu.

40. kṛta-vaire na viśvāsaḥ kāryaḥ tu iha suhṛdi api
channam saṃtiṣṭhate vairam gūḍhaḥ agniḥ iva dāruṣu

40. iha tu kṛta-vaire suhṛdi api na viśvāsaḥ kāryaḥ
vairam channam saṃtiṣṭhate gūḍhaḥ agniḥ iva dāruṣu

40. Indeed, one should not place trust in an established enemy, even if they appear as a friend. Enmity (vaira) remains hidden, like fire concealed in wood.

Words meanings summery:

• कृत-वैरे (kṛta-vaire) - in someone with whom enmity has been formed or is inherent (in one with established enmity, towards an enemy)

• न (na) - not (not, no)

• विश्वासः (viśvāsaḥ) - trust, confidence (trust, confidence, faith)

• कार्यः (kāryaḥ) - should be placed (i.e., trust should be placed) (to be done, to be made, proper to be done)

• तु (tu) - indeed, but (but, indeed, on the other hand)

• इह (iha) - in this world, in this regard (here, in this world)

• सुहृदि (suhṛdi) - even in a (seeming) friend (in a friend, in a kind-hearted person)

• अपि (api) - even (also, even, too)

• छन्नम् (channam) - hidden, concealed (hidden, concealed, covered)

• संतिष्ठते (saṁtiṣṭhate) - remains, exists (stands, remains, exists, continues)

• वैरम् (vairam) - enmity (enmity, hostility)

• गूढः (gūḍhaḥ) - hidden, concealed (hidden, concealed, secret)

• अग्निः (agniḥ) - fire (as a metaphor for hidden enmity) (fire)

• इव (iva) - like (like, as, as if)

• दारुषु (dāruṣu) - in wood (in woods, in logs, in timber)

Words meanings and morphology

कृत-वैरे (kṛta-vaire) - in someone with whom enmity has been formed or is inherent (in one with established enmity, towards an enemy)

(noun)

Locative, masculine, singular of kṛta-vaira

kṛta-vaira - having enmity formed, one with established hostility

Bahuvrīhi compound: "one by whom enmity (vaira) has been made (kṛta)".

Compound type : bahuvrīhi (kṛta+vaira)

• kṛta – done, made, established
  adjective (masculine)
  Past Passive Participle
  From root kṛ (to do, make).
  Root: kṛ (class 8)
• vaira – enmity, hostility
  noun (neuter)

न (na) - not (not, no)

(indeclinable)

Negative particle.

विश्वासः (viśvāsaḥ) - trust, confidence (trust, confidence, faith)

(noun)

Nominative, masculine, singular of viśvāsa

viśvāsa - trust, confidence, faith, reliance

From root vi-śvas (to trust).

Prefix: vi

Root: śvas (class 2)

Note: Null as subject of the implied verb "be".

कार्यः (kāryaḥ) - should be placed (i.e., trust should be placed) (to be done, to be made, proper to be done)

(adjective)

Nominative, masculine, singular of kārya

kārya - to be done, to be made, proper to be done, duty

Gerundive

Gerundive formed from root kṛ (to do, make) with suffix ṇyat or yat.

Root: kṛ (class 8)

Note: Refers to viśvāsaḥ.

तु (tu) - indeed, but (but, indeed, on the other hand)

(indeclinable)

Particle.

Note: Emphatic particle.

इह (iha) - in this world, in this regard (here, in this world)

(indeclinable)

Adverb.

सुहृदि (suhṛdi) - even in a (seeming) friend (in a friend, in a kind-hearted person)

(noun)

Locative, masculine, singular of suhṛd

suhṛd - friend, well-wisher, kind-hearted

Compound: su (good) + hṛd (heart).

Compound type : karmadhāraya (su+hṛd)

• su – good, well, excellent
  indeclinable
  Prefix indicating 'good' or 'well'.
• hṛd – heart, mind
  noun (neuter)

अपि (api) - even (also, even, too)

(indeclinable)

Particle.

छन्नम् (channam) - hidden, concealed (hidden, concealed, covered)

(adjective)

Nominative, neuter, singular of channa

chad - to cover, conceal, hide

Past Passive Participle

From root chad (to cover) with suffix kta.

Root: chad (class 10)

Note: Used adjectivally.

संतिष्ठते (saṁtiṣṭhate) - remains, exists (stands, remains, exists, continues)

(verb)

3rd person , singular, middle, present (laṭ) of sthā

present middle indicative

From root sthā with prefix sam-.

Prefix: sam

Root: sthā (class 1)

वैरम् (vairam) - enmity (enmity, hostility)

(noun)

Nominative, neuter, singular of vaira

vaira - enmity, hostility, hatred, grudge

Note: Subject of saṃtiṣṭhate.

गूढः (gūḍhaḥ) - hidden, concealed (hidden, concealed, secret)

(adjective)

Nominative, masculine, singular of gūḍha

guh - to hide, conceal

Past Passive Participle

From root guh (to hide) with suffix kta.

Root: guh (class 1)

Note: Used adjectivally.

अग्निः (agniḥ) - fire (as a metaphor for hidden enmity) (fire)

(noun)

Nominative, masculine, singular of agni

agni - fire, god of fire

इव (iva) - like (like, as, as if)

(indeclinable)

Particle expressing comparison.

दारुषु (dāruṣu) - in wood (in woods, in logs, in timber)

(noun)

Locative, neuter, plural of dāru

dāru - wood, timber, a log, tree