apa kaṣāya

 Apa kaṣāya most naturally means “free from impurity / free from passion / free from stain,” because apa- is a privative prefix (“away, without”) and kaṣāya denotes impurity, passion, or stain in Sanskrit.

Meaning of kaṣāya

The word kaṣāya has many meanings in Sanskrit, depending on context:

• Astringent taste — one of the six Ayurvedic tastes (ṣaḍ‑rasa)

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• Decoction — a medicinal preparation boiled down from herbs

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• Red or brownish‑red color — especially the color of monastic robes

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• Dirt, impurity, stain — including moral or spiritual impurity

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• Passion, attachment, defilement — in philosophical and religious texts, especially Vedānta, Yoga

Because of this range, kaṣāya can refer to something physically astringent or red, but also to mental defilements or worldly attachments.

Meaning of the prefix apa‑

The Sanskrit prefix apa‑ means:

• “away, off, down,”
• “without, lacking,”
• “free from.”

It regularly forms privative or negative compounds.

Interpreting apa kaṣāya

Although the exact compound apa‑kaṣāya does not appear in the supplied results, Sanskrit morphology makes its meaning straightforward:

• If kaṣāya = impurity, stain, defilement, then apa‑kaṣāya = “without impurity,” “unstained,” “undefiled.”
• If kaṣāya = passion, attachment, then apa‑kaṣāya = “free from passion,” “free from attachment.”
• If kaṣāya = red/brown garment, then apa‑kaṣāya could mean “not wearing the red robe,” though this is less common.

Given the philosophical uses of kaṣāya—e.g., as defilements in Yoga

—the most natural meaning is:

“one who is free from passions/defilements.”

Why this interpretation

• Kaṣāya is explicitly defined as attachment, defilement, or passion in Vedānta and Yoga sources

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• The prefix apa‑ regularly negates or removes the sense of the base word.
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Summary

Apa kaṣāya = “free from impurity, free from stain, free from passion,” depending on which sense of kaṣāya is intended in the context.