योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-29, verse-33

शाल्मल्युग्रदृढापातकटत्कण्टकसंकटाः ।
सुशिलाफलकास्फालशतधाशीर्णमस्तकाः ॥ ३३ ॥

śālmalyugradṛḍhāpātakaṭatkaṇṭakasaṃkaṭāḥ ,
suśilāphalakāsphālaśatadhāśīrṇamastakāḥ 33

33. śālmali-ugra-dṛḍhāpāta-kaṭat-kaṇṭaka-saṃkaṭāḥ
suśilā-phalaka-āṣphāla-śatadhā-śīrṇa-mastakāḥ

33. śālmali-ugra-dṛḍhāpāta-kaṭat-kaṇṭaka-saṃkaṭāḥ (ca)
suśilā-phalaka-āṣphāla-śatadhā-śīrṇa-mastakāḥ (ca āsan)

33. (Furthermore, they were those) who were in great distress from the severe, firm impacts like cracking thorns of a śālmali tree, and whose heads were shattered into a hundred pieces by the blows of mighty stone slabs.

Words meanings summery:

• शाल्मलि-उग्र-दृढापात-कटत्-कण्टक-संकटाः (śālmali-ugra-dṛḍhāpāta-kaṭat-kaṇṭaka-saṁkaṭāḥ) - (those) who were in great distress from the severe, firm impacts like cracking thorns of a śālmali tree (experiencing great distress from cracking thorny impacts like those of a śālmali tree)

• सुशिला-फलक-आष्फाल-शतधा-शीर्ण-मस्तकाः (suśilā-phalaka-āṣphāla-śatadhā-śīrṇa-mastakāḥ) - (those) whose heads were shattered into a hundred pieces by the blows of mighty stone slabs. (whose heads are shattered into a hundred pieces by the impacts of fine stone slabs)

Words meanings and morphology

शाल्मलि-उग्र-दृढापात-कटत्-कण्टक-संकटाः (śālmali-ugra-dṛḍhāpāta-kaṭat-kaṇṭaka-saṁkaṭāḥ) - (those) who were in great distress from the severe, firm impacts like cracking thorns of a śālmali tree (experiencing great distress from cracking thorny impacts like those of a śālmali tree)

(adjective)

Nominative, masculine, plural of śālmali-ugra-dṛḍhāpāta-kaṭat-kaṇṭaka-saṃkaṭa

śālmali-ugra-dṛḍhāpāta-kaṭat-kaṇṭaka-saṁkaṭa - having distress from severe cracking thorny impacts like a śālmali tree

Compound type : Bahuvrihi (śālmali+ugra+dṛḍha+āpāta+kaṭat+kaṇṭaka+saṃkaṭa)

• śālmali – silk-cotton tree (Salmalia malabarica), known for its thorns
  noun (feminine)
• ugra – severe, fierce, terrible
  adjective
• dṛḍha – firm, strong, hard
  adjective
  Past Passive Participle
  from √dṛṃh (to make firm)
  Root: √dṛṃh (class 1)
• āpāta – fall, descent, impact
  noun (masculine)
  from ā-√pat
  Prefix: ā
  Root: √pat (class 1)
• kaṭat – cracking, snapping
  adjective
  Present Active Participle
  from √kaṭ (to crackle, snap)
  Root: √kaṭ (class 1)
• kaṇṭaka – thorn, prickle, impediment
  noun (masculine)
• saṃkaṭa – distress, difficulty, danger, crisis
  noun (neuter)
  Prefix: sam

Note: refers to the asuras (demons).

सुशिला-फलक-आष्फाल-शतधा-शीर्ण-मस्तकाः (suśilā-phalaka-āṣphāla-śatadhā-śīrṇa-mastakāḥ) - (those) whose heads were shattered into a hundred pieces by the blows of mighty stone slabs. (whose heads are shattered into a hundred pieces by the impacts of fine stone slabs)

(adjective)

Nominative, masculine, plural of suśilā-phalaka-āṣphāla-śatadhā-śīrṇa-mastaka

suśilā-phalaka-āṣphāla-śatadhā-śīrṇa-mastaka - having heads shattered into a hundred pieces by the impacts of good stone slabs

Compound type : Bahuvrihi (su+śilā+phalaka+āṣphāla+śatadhā+śīrṇa+mastaka)

• su – good, well, mighty, excellent
  indeclinable
• śilā – stone, rock
  noun (feminine)
• phalaka – slab, board, shield
  noun (masculine)
• āṣphāla – impact, blow, striking
  noun (masculine)
  from ā-√sphal (to strike, clash)
  Prefix: ā
  Root: √sphal (class 1)
• śatadhā – into a hundred parts, a hundredfold
  indeclinable
  suffix -dhā (in parts, ways)
• śīrṇa – shattered, broken, torn
  adjective
  Past Passive Participle
  from √śṝ (to tear, break)
  Root: √śṝ (class 9)
• mastaka – head, skull
  noun (neuter)

Note: refers to the asuras (demons).