1. having no fresh air; stuffy and uncomfortable
2. having no wind or breeze; completely still
3. lacking atmosphere or air
Usage: scientific

Examples

• The basement room was airless and uncomfortable.
• We opened the windows to let fresh air into the airless office.
• The airless summer day made everyone feel sluggish.
• It was an airless night without even the slightest breeze.
• The spacecraft traveled through airless space.
• The old attic felt hot and airless.
• Plants cannot survive in an airless environment.