महाभारतः mahābhārataḥ - book-9, chapter-59, verse-6

अधो नाभ्या न हन्तव्यमिति शास्त्रस्य निश्चयः ।
अयं त्वशास्त्रविन्मूढः स्वच्छन्दात्संप्रवर्तते ॥६॥

6. adho nābhyā na hantavyamiti śāstrasya niścayaḥ ,
ayaṁ tvaśāstravinmūḍhaḥ svacchandātsaṁpravartate.

6. adhaḥ nābhyā na hantavyam iti śāstrasya niścayaḥ
ayam tu aśāstravit mūḍhaḥ svacchandāt sampravartate

6. śāstrasya niścayaḥ iti (yat) nābhyāḥ adhaḥ na hantavyam
tu ayam aśāstravit mūḍhaḥ svacchandāt sampravartate

6. It is the established rule (śāstra) that one should not strike below the navel. However, this foolish person, ignorant of the scripture (śāstra), acts purely out of his own accord.

Words meanings summery:

• अधः (adhaḥ) - below, down, underneath

• नाभ्या (nābhyā) - by the navel, from the navel

• न (na) - not, no

• हन्तव्यम् (hantavyam) - to be struck, to be killed, ought to be struck

• इति (iti) - thus, in this manner, marking direct speech or conclusion

• शास्त्रस्य (śāstrasya) - of the established rule/scripture (of the scripture, of the treatise, of the rule)

• निश्चयः (niścayaḥ) - decision, ascertainment, certainty, rule

• अयम् (ayam) - this (masculine)

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

• अशास्त्रवित् (aśāstravit) - not knowing the scripture, ignorant of the rules

• मूढः (mūḍhaḥ) - foolish, ignorant, deluded one

• स्वच्छन्दात् (svacchandāt) - from one's own will, by one's own accord, freely

• सम्प्रवर्तते (sampravartate) - proceeds, acts, behaves fully

Words meanings and morphology

अधः (adhaḥ) - below, down, underneath

(indeclinable)

नाभ्या (nābhyā) - by the navel, from the navel

(noun)

Instrumental, feminine, singular of nābhi

nābhi - navel, nave of a wheel, center, hub, relative

न (na) - not, no

(indeclinable)

हन्तव्यम् (hantavyam) - to be struck, to be killed, ought to be struck

(adjective)

Nominative, neuter, singular of hantavya

hantavya - to be killed, to be struck, to be hurt, to be destroyed

Gerundive

Future Passive Participle formed with suffix -tavya from root han

Root: han (class 2)

इति (iti) - thus, in this manner, marking direct speech or conclusion

(indeclinable)

शास्त्रस्य (śāstrasya) - of the established rule/scripture (of the scripture, of the treatise, of the rule)

(noun)

Genitive, neuter, singular of śāstra

śāstra - treatise, scripture, rule, precept, science, doctrine

Root: śās (class 2)

निश्चयः (niścayaḥ) - decision, ascertainment, certainty, rule

(noun)

Nominative, masculine, singular of niścaya

niścaya - certainty, ascertainment, decision, determination, conviction

Derived from root ci with prefix nis

Prefix: nis

Root: ci (class 5)

अयम् (ayam) - this (masculine)

(pronoun)

Nominative, masculine, singular of idam

idam - this, this here

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

(indeclinable)

अशास्त्रवित् (aśāstravit) - not knowing the scripture, ignorant of the rules

(adjective)

Nominative, masculine, singular of aśāstravit

aśāstravit - ignorant of the śāstras, not knowing the scriptures or rules

Compound type : tatpuruṣa (a+śāstra+vit)

• a – not, non-, un-
  indeclinable
  Negative prefix
• śāstra – treatise, scripture, rule, precept, science, doctrine
  noun (neuter)
  Root: śās (class 2)
• vit – knowing, expert, intelligent
  adjective (masculine/feminine/neuter)
  Agent Noun/Adjective from root
  Derived from root vid (to know)
  Root: vid (class 2)

मूढः (mūḍhaḥ) - foolish, ignorant, deluded one

(adjective)

Nominative, masculine, singular of mūḍha

mūḍha - foolish, stupid, deluded, bewildered, ignorant person

Past Passive Participle

Past passive participle of root muh

Root: muh (class 4)

स्वच्छन्दात् (svacchandāt) - from one's own will, by one's own accord, freely

(noun)

Ablative, masculine, singular of svacchanda

svacchanda - one's own will, freedom, self-willed, free, independent

Compound type : karmadhāraya (sva+chanda)

• sva – own, one's own, self
  adjective (masculine/feminine/neuter)
• chanda – will, desire, pleasure, wish, intention
  noun (masculine)

सम्प्रवर्तते (sampravartate) - proceeds, acts, behaves fully

(verb)

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

Prefixes: sam+pra

Root: vṛt (class 1)