Abhinivesha.

 Here are some rare and beautiful Sanskrit words along with their meanings:

1. अभिनिवेश (Abhinivesha):

Meaning: Deep attachment or clinging, especially to life and worldly existence. In a spiritual context, it refers to the fear of death or the tendency to cling to life.

2. अलस्यम् (Alasyam):

Meaning: Lethargy or laziness; a mental state of inactivity or lack of enthusiasm.

3. अमल (Amala):

Meaning: Pure, spotless, or without blemish.

4. अभिज्ञान (Abhijñāna):

Meaning: Direct knowledge or supernatural insight, often referring to mystical or intuitive wisdom.

5. अहिंसा (Ahimsā):

Meaning: Non-violence, the principle of causing no harm to living beings, central to many Indian spiritual traditions.

6. आदित्यवदन (Adityavadana):

Meaning: Someone whose face shines like the sun, symbolizing brilliance or radiance.

7. अग्रमन्तव्य (Agramantavya):

Meaning: One who should be followed or someone worth following, implying leadership or excellence.

8. बोधि (Bodhi):

Meaning: Enlightenment or awakening; the state of having transcended ignorance and realized the ultimate truth.

9. चेतना (Chetanā):

Meaning: Consciousness, awareness, or sentience, referring to the mental or spiritual faculty of awareness.

10. दृढनिश्चय (Dridhanishchaya):

Meaning: Firm determination or unshakable resolve, often used in the context of dedication to a spiritual goal.

11. दुर्जन (Durjana):

Meaning: A wicked or malevolent person, someone who lacks moral or ethical virtues.

12. ईशान्य (Ishanya):

Meaning: Northeastern direction; often associated with Lord Shiva, who is also called Isha, the lord of the universe.

13. कल्याण (Kalyāṇa):

Meaning: Auspiciousness, welfare, or well-being; often used to denote something that brings about good fortune or happiness.

14. निर्वाण (Nirvāṇa):

Meaning: Liberation or freedom from the cycle of birth and death (Samsara); ultimate spiritual liberation.

15. प्रज्ञा (Prajñā):

Meaning: Wisdom or intelligence, particularly spiritual wisdom that leads to enlightenment.

16. शरणागत (Śaraṇāgata):

Meaning: One who has sought refuge, a person who surrenders to a higher power for protection.

17. सौम्य (Saumya):

Meaning: Gentle, calm, or serene; often used to describe a soft-spoken, kind-hearted person.

18. स्वाध्याय (Svādhyāya):

Meaning: Self-study or the practice of studying sacred texts as a part of personal spiritual development.

19. रूपांतर (Rūpāntara):

Meaning: Transformation or metamorphosis; the change from one form to another.

20. विलम्ब (Vilamba):

Meaning: Delay or procrastination, often used in the context of avoiding or postponing important tasks.

These words capture various facets of life, spiritual practice, and human experience in Sanskrit's rich and expressive language.