noun, な adjective
Know how 意識 is "consciousness"? What about when this consciousness doesn't exist (aka it is nothing)? That's when it becomes unconsciousness.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will help to know how to read 意識, though.
I can't help but unconsciously tongue the cavity in my tooth with the tip of my tongue.
That involuntary habit of biting your nails should be fixed.
We’re awesome because we can be unconsciously creative.