1) Affectation 2) Capaciousness 3) Commodiousness 4) Ethereal quality 5) Gaiety 6) Lightness 7) Nonchalance 8) Open quality 9) Quality of atria 10) Roominess 11) Snobbishness 12) Spaciousness 13) Sprightly manner 14) Vivacity; delicacy 
• (n.) Lightness of spirits; gayety; levity; as, the airiness of young persons. • (n.) The state or quality of being airy; openness or exposure to the air; as, the airiness of a country seat.
Air'i·ness noun 1. The state or quality of being airy; openness or exposure to the air; as, the airiness of a country seat. 2. Lightness of spirits; gayety; levity; as, the airiness of young persons. 
[n] - the property of something spacious and abounding in fresh air 2. [n] - the property of something weightless and insubstantial 3. [n] - lightness in movement or manner
buoyancy noun the property of something weightless and insubstantial
openness to the air: the airiness of a balcony facing the sea. · sprightliness of manner: a ballet marked by airiness and deft movement. · snobbishness; affectation.