IPA: /ˈɛr.ləs.nəs/
KK: /ˈɛr.ləs.nəs/
The condition of having no air or very little air, which can make it difficult to breathe or feel comfortable.
The airlessness in the room made it difficult to breathe comfortably.
Airlessness → It is formed from "air" (from Old French *air*, meaning the invisible gaseous substance surrounding the earth) and "-lessness" (meaning without). The word "airlessness" means the state of being without air.
Think of being 'without' ('-lessness') the 'air' that surrounds us — that's what airlessness means.