The quality of being light (low weight), or a lightness in movement or atmosphere; the opposite of heaviness.
このバッグは軽さが魅力だ。
The bag's lightness is its appeal.
彼女の話し方には軽さがあり、聞いていて楽しい。
Her way of speaking has a lightness that makes it pleasant to listen to.
段ボールの軽さを確認してから運んでください。
Please check the lightness of the cardboard boxes before carrying them.