How to say "which / what (archaic, literary)" in Russian?

[Koy]

"which / what (archaic, literary)" is Кой in Russian.

Кой means "which / what (archaic, literary)" in English.

Word #1209 of 6,000 by frequency in Russian.

На кой тебе это нужно?

What on earth do you need this for?

• Бедный, poor
• Продукт, product
• Включить, to turn on, to include
• Западный, Western
• Союз, Union
• Единый, unified, single
• Половина, Half
• Сумка, Bag