योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-3, verse-22

आतिवाहिकमेवान्तर्विस्मृत्या दृढरूपया ।
आधिभौतिकबोधेन मुधा भाति पिशाचवत् ॥ २२ ॥

ātivāhikamevāntarvismṛtyā dṛḍharūpayā ,
ādhibhautikabodhena mudhā bhāti piśācavat 22

22. ātivāhikam eva antar vismṛtyā dṛḍharūpayā
ādhibhautikabodhena mudhā bhāti piśācavat

22. ātivāhikam eva antar dṛḍharūpayā vismṛtyā
ādhibhautikabodhena mudhā piśācavat bhāti

22. When the subtle (ātivāhika) body itself is firmly forgotten internally, it appears in vain, through the perception of gross (ādhibhautika) reality, just like a ghost.

Words meanings summery:

• आतिवाहिकम् (ātivāhikam) - the subtle (ātivāhika) body (subtle, ethereal, pertaining to the subtle body)

• एव (eva) - only, indeed, itself

• अन्तर् (antar) - within, internally, inside

• विस्मृत्या (vismṛtyā) - by forgetting, through forgetfulness

• दृढरूपया (dṛḍharūpayā) - by a firm (dṛḍha) forgetfulness (by a firm form, by a firm nature)

• आधिभौतिकबोधेन (ādhibhautikabodhena) - through the perception of gross (ādhibhautika) reality (by material perception/knowledge)

• मुधा (mudhā) - in vain, uselessly, fruitlessly

• भाति (bhāti) - appears, shines, seems

• पिशाचवत् (piśācavat) - like a ghost

Words meanings and morphology

आतिवाहिकम् (ātivāhikam) - the subtle (ātivāhika) body (subtle, ethereal, pertaining to the subtle body)

(adjective)

Nominative, neuter, singular of ātivāhika

ātivāhika - subtle, ethereal, belonging to the subtle body (ātivāhika-śarīra)

from ati-vah, related to carrying over

Note: Implied noun is 'śarīra' (body)

एव (eva) - only, indeed, itself

(indeclinable)

अन्तर् (antar) - within, internally, inside

(indeclinable)

विस्मृत्या (vismṛtyā) - by forgetting, through forgetfulness

(noun)

Instrumental, feminine, singular of vismṛti

vismṛti - forgetfulness, oblivion

from vi-smṛ

Prefix: vi

Root: smṛ (class 1)

दृढरूपया (dṛḍharūpayā) - by a firm (dṛḍha) forgetfulness (by a firm form, by a firm nature)

(adjective)

Instrumental, feminine, singular of dṛḍharūpa

dṛḍharūpa - firm-formed, having a solid nature

Compound type : karmadhāraya (dṛḍha+rūpa)

• dṛḍha – firm, strong, solid, resolute
  adjective (masculine)
  Past Passive Participle
  from dṛh
  Root: dṛh (class 1)
• rūpa – form, nature, appearance
  noun (neuter)

Note: Qualifies 'vismṛtyā'

आधिभौतिकबोधेन (ādhibhautikabodhena) - through the perception of gross (ādhibhautika) reality (by material perception/knowledge)

(noun)

Instrumental, masculine, singular of ādhibhautikabodhena

ādhibhautikabodhena - by material knowledge/perception

Compound type : tatpuruṣa (ādhibhautika+bodha)

• ādhibhautika – pertaining to material elements/beings, physical
  adjective (masculine)
  from adhi-bhūta
  Prefix: adhi
  Root: bhū (class 1)
• bodha – perception, knowledge, awakening, understanding
  noun (masculine)
  from budh
  Root: budh (class 1)

मुधा (mudhā) - in vain, uselessly, fruitlessly

(indeclinable)

भाति (bhāti) - appears, shines, seems

(verb)

3rd person , singular, active, present (lat) of bhā

Root: bhā (class 2)

पिशाचवत् (piśācavat) - like a ghost

(indeclinable)

suffix vat for similarity