योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-23, verse-15

तत्रासिमुसलप्रासवज्रचक्रगदादयः ।
हेतयः कुण्ठतां यान्ति दृषदीवोत्पलाहतिः ॥ १५ ॥

tatrāsimusalaprāsavajracakragadādayaḥ ,
hetayaḥ kuṇṭhatāṃ yānti dṛṣadīvotpalāhatiḥ 15

15. tatra asimusalaprāsavajracakragadādayaḥ
hetayaḥ kuṇṭhatām yānti dṛṣadi iva utpalāhatiḥ

15. tatra asimusalaprāsavajracakragadādayaḥ
hetayaḥ dṛṣadi utpalāhatiḥ iva kuṇṭhatām yānti

15. Against that, weapons such as swords, maces, spears, thunderbolts, discs, and clubs become blunt, just as the strike of a lotus blossom upon a stone would.

Words meanings summery:

• तत्र (tatra) - against the power/entity previously described (there, in that place, in that situation)

• असिमुसलप्रासवज्रचक्रगदादयः (asimusalaprāsavajracakragadādayaḥ) - various types of weapons (swords, maces, spears, thunderbolts, discs, clubs, and so on)

• हेतयः (hetayaḥ) - weapons, instruments

• कुण्ठताम् (kuṇṭhatām) - becoming ineffective (dullness, bluntness, ineffectiveness (accusative))

• यान्ति (yānti) - they become (dull) (they go, they attain)

• दृषदि (dṛṣadi) - on a stone, on a rock

• इव (iva) - like, as, as if

• उत्पलाहतिः (utpalāhatiḥ) - strike of a lotus, impact of a lotus

Words meanings and morphology

तत्र (tatra) - against the power/entity previously described (there, in that place, in that situation)

(indeclinable)

From pronominal stem tad + suffix tral

असिमुसलप्रासवज्रचक्रगदादयः (asimusalaprāsavajracakragadādayaḥ) - various types of weapons (swords, maces, spears, thunderbolts, discs, clubs, and so on)

(noun)

Nominative, masculine, plural of asimusalaprāsavajracakragadādi

asimusalaprāsavajracakragadādi - swords, maces, spears, thunderbolts, discs, clubs, and others

A dvandva compound listing various weapons, suffixed with ādi (etc.)

Compound type : dvandva (asi+musala+prāsa+vajra+cakra+gadā+ādi)

• asi – sword
  noun (masculine)
• musala – mace, club, pestle
  noun (masculine)
• prāsa – spear, dart, javelin
  noun (masculine)
  Root: as (class 4)
• vajra – thunderbolt, diamond, Indra's weapon
  noun (neuter)
• cakra – wheel, disc, army, region
  noun (neuter)
• gadā – club, mace
  noun (feminine)
• ādi – beginning, source, first, and so on
  noun (masculine)

Note: The entire compound acts as a single nominative plural noun.

हेतयः (hetayaḥ) - weapons, instruments

(noun)

Nominative, feminine, plural of heti

heti - weapon, missile, instrument, cause

Root: hi (class 3)

Note: Refers to the collective group of weapons mentioned.

कुण्ठताम् (kuṇṭhatām) - becoming ineffective (dullness, bluntness, ineffectiveness (accusative))

(noun)

Accusative, feminine, singular of kuṇṭhatā

kuṇṭhatā - dullness, bluntness, sluggishness, ineffectiveness

From kuṇṭha (dull, blunt) + suffix -tā (feminine noun forming suffix)

Note: Used with yānti ("go to dullness") to mean "become dull."

यान्ति (yānti) - they become (dull) (they go, they attain)

(verb)

3rd person , plural, active, present indicative (laṭ) of yā

Root: yā (class 2)

दृषदि (dṛṣadi) - on a stone, on a rock

(noun)

Locative, feminine, singular of dṛṣad

dṛṣad - stone, rock

इव (iva) - like, as, as if

(indeclinable)

उत्पलाहतिः (utpalāhatiḥ) - strike of a lotus, impact of a lotus

(noun)

Nominative, feminine, singular of utpalāhati

utpalāhati - strike of a lotus, impact of a lotus

Compound of utpala (lotus) and āhati (strike)

Compound type : tatpuruṣa (utpala+āhati)

• utpala – lotus (Nymphaea esculenta), water-lily
  noun (neuter)
• āhati – strike, blow, impact, shock, injury
  noun (feminine)
  Prefix: ā
  Root: han (class 2)