महाभारतः mahābhārataḥ - book-12, chapter-148, verse-21

न निःशेषेण मन्तव्यमचिकित्स्येन वा पुनः ।
न जातु नाहमस्मीति प्रसक्तव्यमसाधुषु ॥२१॥

21. na niḥśeṣeṇa mantavyamacikitsyena vā punaḥ ,
na jātu nāhamasmīti prasaktavyamasādhuṣu.

21. na niḥśeṣeṇa mantavyam acikitsyena vā punaḥ na
jātu na aham asmi iti prasaktavyam asādhuṣu

21. na niḥśeṣeṇa vā punaḥ acikitsyena mantavyam na
jātu asādhuṣu na aham asmi iti prasaktavyam

21. One should not consider (a fault or condition) as entirely beyond remedy or incurable. Likewise, one should never associate with wicked people, thinking, 'I am not like them.'

Words meanings summery:

• न (na) - not, no, nor

• निःशेषेण (niḥśeṣeṇa) - entirely, completely, without remainder

• मन्तव्यम् (mantavyam) - should be thought, is to be considered

• अचिकित्स्येन (acikitsyena) - as incurable, by that which is incurable

• वा (vā) - or, either

• पुनः (punaḥ) - again, further, moreover

• न (na) - not, no, nor

• जातु (jātu) - ever, at any time (with 'na', never)

• न (na) - not, no, nor

• अहम् (aham) - I

• अस्मि (asmi) - I am

• इति (iti) - thus, in this way, indicating a quotation or thought

• प्रसक्तव्यम् (prasaktavyam) - should be engaged, should be attached, should be associated

• असाधुषु (asādhuṣu) - among the wicked, with the bad people

Words meanings and morphology

न (na) - not, no, nor

(indeclinable)

निःशेषेण (niḥśeṣeṇa) - entirely, completely, without remainder

(adjective)

Instrumental, neuter, singular of niḥśeṣa

niḥśeṣa - entire, complete, without remainder

Compound type : bahuvrīhi (nis+śeṣa)

• nis – out, forth, without
  indeclinable
  prefix
• śeṣa – remainder, residue, end
  noun (masculine)
  Root: śiṣ (class 7)

Note: Adverbial usage of instrumental case.

मन्तव्यम् (mantavyam) - should be thought, is to be considered

(adjective)

Nominative, neuter, singular of mantavya

mantavya - to be thought, to be considered, knowable

Gerundive

Derived from √man (to think) with suffix -tavya

Root: man (class 4)

Note: Potential passive participle (gerundive) used impersonally.

अचिकित्स्येन (acikitsyena) - as incurable, by that which is incurable

(adjective)

Instrumental, neuter, singular of acikitsya

acikitsya - incurable, irremediable

Gerundive

Negative particle 'a' + gerundive of causative of √kit (to treat).

Compound type : nañ-tatpuruṣa (a+cikitsya)

• a – not, un-
  indeclinable
  negative particle
• cikitsya – curable, treatable
  adjective (masculine)
  Gerundive
  Gerundive of causative of √kit
  Root: kit (class 10)

Note: Adverbial usage of instrumental case.

वा (vā) - or, either

(indeclinable)

पुनः (punaḥ) - again, further, moreover

(indeclinable)

न (na) - not, no, nor

(indeclinable)

जातु (jātu) - ever, at any time (with 'na', never)

(indeclinable)

न (na) - not, no, nor

(indeclinable)

अहम् (aham) - I

(pronoun)

Nominative, singular of asmad

asmad - I, we

अस्मि (asmi) - I am

(verb)

1st person , singular, active, present indicative (laṭ) of as

Root: as (class 2)

इति (iti) - thus, in this way, indicating a quotation or thought

(indeclinable)

प्रसक्तव्यम् (prasaktavyam) - should be engaged, should be attached, should be associated

(adjective)

Nominative, neuter, singular of prasaktavya

prasaktavya - to be attached, to be devoted, to be engaged

Gerundive

Derived from √sañj (to cling, attach) with prefix 'pra' and suffix -tavya

Prefix: pra

Root: sañj (class 7)

Note: Potential passive participle (gerundive) used impersonally.

असाधुषु (asādhuṣu) - among the wicked, with the bad people

(adjective)

Locative, masculine, plural of asādhu

asādhu - wicked, bad, evil, not good

Compound type : nañ-tatpuruṣa (a+sādhu)

• a – not, un-
  indeclinable
  negative particle
• sādhu – good, virtuous, righteous, holy man
  adjective (masculine)

Note: Refers to wicked persons.