Thoughtlessly aware means,
You are aware but there is no thought.
When the Kundalini crosses the Agnya (chakra), you become thoughtlessly aware. Thoughtlessly aware means, you are aware but there is no thought. You become silent. When it crosses the brahmarandra then the vibrations start flowing through you, and you get cool vibrations.
©Shri Mataji Nirmala Devi - Founder of Sahaja Yoga
1977 – February 22, Delhi, India"