Also means
flippancy
Usage Note
Ligereza has two distinct registers: the physical sense of low weight or nimbleness (la ligereza del aluminio, the lightness of aluminium) and the figurative sense of rashness or thoughtlessness (hablar con ligereza, to speak carelessly). Context makes the intended sense clear; confusing the two is a common learner error. The related adjective is ligero.
Examples
"La ligereza del material lo hace ideal para la aviación."
Natural Translation
The lightness of the material makes it ideal for aviation.

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